“Cry over spilled milk”

“The calm before the storm”

A quiet period before trouble or intense activity begins.

“Tighten your belt”

To spend less money than before.

“Smell a rat”

To suspect that something is wrong or dishonest.

“The ballpark figure”

An approximate number or estimate.

“The final straw”

The last problem that makes a situation unacceptable.

“Cry wolf”

To ask for help when there is no real danger, so people stop believing you.

“Think outside the box”

To think creatively and differently from usual.

“Take the plunge”

To decide to do something important or risky.