“Cross your mind”

“Hold your horses”

To wait or be patient.

“By the skin of your teeth”

Barely; just in time.

“Speak your mind”

To say what you really think.

“Wear your heart on your sleeve”

To show your feelings openly.

“Keep your chin up”

Stay positive in a difficult situation.

“You can’t have your cake and eat it too”

You can’t have two incompatible advantages at the same time.

“Put your money where your mouth is”

To support your words with actions.

“Your guess is as good as mine”

I don’t know either.