Fair game

Example

The tourists were fair game for the pickpockets

To be thin on the ground

Example

Today steady jobs are often thin on the ground

Make it or break it

Example

I will present my innovative make-or-break proposal

Luck of the draw

Example

Success is a luck of the draw. Those who can't reach it often say this!

Turn sb/sth inside out

Example

These weeks have been really intense, they have turned me inside out 

Off the cuff

Example

Made an amazing speech, off the cuff

Take or leave

Example

The conditions are non-negotiable, take it or leave it

Doze off

Example

Drowsy driving is a major safety hazard. What to do if you doze off while driving

Doesn't begin to cover

Example

The term 'devastated' doesn't begin to cover how we felt after losing our home in the flood

For my liking

Example

This bar is a little too crowded for my liking