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