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