Bite off more than you can ....
Bite off more than you can chew.
The ball is in your ....
The ball is in your court.
Don't put all your eggs in one ....
Don't put all your eggs in one basket.
The best thing since ... bread.
The best thing since sliced bread.
... the hook.
Off the hook.
I ... a rat.
I smell a rat.
You're ... up the wrong tree.
You're barking up the wrong tree.
Once in a ... moon.
Once in a blue moon.
Kill ... birds with one stone.
Kill two birds with one stone.
... the hatchet.
Bury the hatchet.
Cross that ... when you come to it.
Cross that bridge when you come to it.
Let ... dogs lie.
Let sleeping dogs lie.
Take it with a ... of salt.
Take it with a grain of salt.
Let's ... the knot.
Let's tie the knot.
It's the ... of both worlds.
It's the best of both worlds.
As ... as a rock.
As solid as a rock.
At the ... of a hat.
At the drop of a hat.
It's a ... in the bucket.
It's a drop in the bucket.
Actions ... louder than words.
Actions speak louder than words.
Every cloud has a ... lining.
Every cloud has a silver lining.
It's a ... of cake.
It's a piece of cake.