... the hatchet.
Bury the hatchet.
It's a ... in the bucket.
It's a drop in the bucket.
Once in a ... moon.
Once in a blue moon.
A leopard can't ... its spots.
A leopard can't change its spots.
I ... a rat.
I smell a rat.
Let's ... the knot.
Let's tie the knot.
Kill ... birds with one stone.
Kill two birds with one stone.
