Idioms - Free Printable

Explanation:
We need to fill in the blanks using the correct idioms from the list. Each sentence gives a clue about the meaning, and we match it with the idiom that fits both the context and the definition.

Let’s go one by one:

a) “I have to tell you something that will ________.”
→ This suggests a big surprise or shocking news — likely *let the cat out of the bag* (to reveal a secret, especially unintentionally). But wait — “I have to tell you” sounds intentional, not accidental. Let’s hold and check others.

b) “He ________ when he accidentally told her about the surprise party.”
→ Accidentally revealing a secret → *let the cat out of the bag* fits perfectly here. So (b) = let the cat out of the bag.

c) “Okay, I’ll tell you what I’m going to do, although you’ll probably think that I have ________.”
→ Saying something bold or crazy — possibly *lost my marbles* (to act in a crazy or strange way), but “I have lost my marbles” is common. Or *cold feet*? No — cold feet = lose courage *before* doing something. Here, the speaker is about to announce a plan, and expects the listener to think they’re crazy. So *lost my marbles* fits: “I have lost my marbles” = I’m acting crazy. ✔️

d) “I’m ________ with my teacher because she caught me cheating in the test.”
→ In serious trouble → *in hot water* means to be in difficulties, especially serious trouble. ✔️

e) “I’d better ________ now. I’m feeling really exhausted.”
→ To go to bed → *hit the sack*. ✔️

f) “He is so cute that when he looks at me I get ________.”
→ Feeling nervous/anxious around someone attractive → *butterflies in one’s stomach*. ✔️

g) “We’re all packed and ready to go — we can leave ________.”
→ Immediately, without delay → *at the drop of a hat*. ✔️

h) “I am feeling a bit ________ — I think I’m getting a cold.”
→ Under the weather = to be ill or feel unwell. ✔️

i) “Is Samantha really getting married or are you just ________?”
→ Joking/teasing → *pulling my leg* (or *pull one’s leg*) = to play a joke or tease. The phrase is “pull one’s leg”, and the blank is after “you are just”, so: pulling my leg — but the idiom listed is *pull one’s leg*, and the blank is “you are just ________”, so we say pulling my leg (common phrasing). However, since the idiom is given as *pull one’s leg*, and the sentence uses “you”, it should be “you are just pulling my leg”. But the blank is only for the idiom part — likely they expect pulling my leg, though strictly the idiom is “pull one’s leg”. In worksheets like this, they accept “pulling my leg” as the fill-in. Alternatively, maybe they want just the base idiom form? Let’s see pattern: other blanks use full phrases like “in hot water”, not conjugated. Actually, looking at (d): “I’m ________ with my teacher” → answer is “in hot water” (not “am in hot water”). So they expect the idiom phrase as listed. So for (i), the idiom is *pull one’s leg*, but the sentence says “are you just ________?” → we need a phrase that fits grammatically. “Pulling my leg” is natural. But the worksheet lists *pull one’s leg* — and in such exercises, they often accept “pulling my leg**” as the fill-in. Let’s keep that.

Wait — let’s double-check all idioms provided and match exactly:

Listed idioms:
- in hot water
- butterflies in one’s stomach
- under the weather
- hold your horses
- a piece of cake
- knock one’s socks off
- let the cat out of the bag
- at the drop of a hat
- cost an arm and a leg
- pull one’s leg
- caught between two stools
- lose one’s marbles
- hit the sack
- all ears
- cold feet

Now re-evaluate each sentence:

a) “I have to tell you something that will ________.”
What idiom means “surprise/astound someone”? → *knock one’s socks off* = to delight, thrill, amaze, impress. Yes! If you say something amazing, it can *knock their socks off*. So (a) = knock my socks off? But the idiom is “knock one’s socks off”, and sentence says “will ________”, so “knock my socks off” fits grammatically. However, worksheets often accept the base form, but here blank is after “will”, so verb form needed. “Knock my socks off” is correct usage. But let’s see if any other fits better.

Alternatively, *blow your mind* isn’t listed. Only listed ones allowed. So *knock one’s socks off* is best. We’ll use knock my socks off (customized to subject).

But wait — maybe (a) is *all ears*? No — “I have to tell you something that will all ears” makes no sense. *All ears* = to listen attentively — used as “I’m all ears”, not “will all ears”.

So (a) → knock my socks off

b) Already: let the cat out of the bag

c) “you’ll probably think that I have ________” → *lost my marbles* (idiom: lose one’s marbles). Sentence uses “I have”, so “lost my marbles” is correct. ✔️

d) in hot water

e) hit the sack

f) butterflies in my stomach — but idiom is “butterflies in one’s stomach”; blank after “I get”, so “butterflies in my stomach” is natural. Worksheet likely accepts that.

g) at the drop of a hat

h) under the weather

i) “are you just ________?” → *pulling my leg* (from *pull one’s leg*)

j) “Was your Math exam hard? – No, it was really ________.” → *a piece of cake* = something very easy. ✔️

k) “My friend got ________ and decided not to do a bungee jump.” → *cold feet* = to lose courage to do something planned. ✔️

l) “Just ________! Let’s think about this for a moment.” → *hold your horses* = wait / slow down. ✔️

m) “Tell me who was at the party. I am ________.” → *all ears* = eager to hear / listen attentively. ✔️

n) “If you try to please both your father and mother, you can end up ________.” → *caught between two stools* = unable to choose between two alternatives. ✔️

o) “I don’t know how you could afford this sports car. It must have ________.” → *cost an arm and a leg* = very expensive. ✔️

Now verify all 15 blanks:

a) knock my socks off
b) let the cat out of the bag
c) lost my marbles
d) in hot water
e) hit the sack
f) butterflies in my stomach
g) at the drop of a hat
h) under the weather
i) pulling my leg
j) a piece of cake
k) cold feet
l) hold your horses
m) all ears
n) caught between two stools
o) cost an arm and a leg

All match meanings and grammar.

Final Answer:
a) knock my socks off
b) let the cat out of the bag
c) lost my marbles
d) in hot water
e) hit the sack
f) butterflies in my stomach
g) at the drop of a hat
h) under the weather
i) pulling my leg
j) a piece of cake
k) cold feet
l) hold your horses
m) all ears
n) caught between two stools
o) cost an arm and a leg