... the hook.
Off the hook.
The ball is in your ....
The ball is in your court.
It's a ... of cake.
It's a piece of cake.
It's a ... in the bucket.
It's a drop in the bucket.
At the ... of a hat.
At the drop of a hat.
Once in a ... moon.
Once in a blue moon.
Cross that ... when you come to it.
Cross that bridge when you come to it.
... the hatchet.
Bury the hatchet.
... your tongue.
Bite your tongue.
As ... as a rock.
As solid as a rock.
Let's ... the knot.
Let's tie the knot.
Bite off more than you can ....
Bite off more than you can chew.
Don't put all your eggs in one ....
Don't put all your eggs in one basket.
A leopard can't ... its spots.
A leopard can't change its spots.
It's the ... of both worlds.
It's the best of both worlds.
You're ... up the wrong tree.
You're barking up the wrong tree.
Every cloud has a ... lining.
Every cloud has a silver lining.
Curiosity ... the cat.
Curiosity killed the cat.
Let ... dogs lie.
Let sleeping dogs lie.
It's a ... in disguise.
It's a blessing in disguise.
She's a ... horse.
She's a dark horse.
Kill ... birds with one stone.
Kill two birds with one stone.
... on the bandwagon.
Jump on the bandwagon.
Feeling ... the weather.
Feeling under the weather.
I'll be glad to see the ... of him.
I'll be glad to see the back of him.
Close, but no ....
Close, but no cigar.
The best thing since ... bread.
The best thing since sliced bread.
I ... a rat.
I smell a rat.
Burn the ... oil.
Burn the midnight oil.
Actions ... louder than words.
Actions speak louder than words.
Sit on the ....
Sit on the fence.
Take it with a ... of salt.
Take it with a grain of salt.