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