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