“At the end of the day”

“By the skin of your teeth”

Barely; just in time.

“Speak of the devil”

The person you were talking about appears.

“The tip of the iceberg”

A small visible part of a much bigger problem or situation.

“Get the hang of it”

To learn how to do something.

“Give someone the benefit of the doubt”

To believe someone may be telling the truth even if you are not sure.

“Let the cat out of the bag”

To reveal a secret accidentally or intentionally.

“Burn the candle at both ends”

To work too hard and not rest enough.

“The best of both worlds”

A situation where you enjoy two different advantages.