Clear the air

Meaning:
To get rid of unpleasant air and replace it with fresh air. To discuss an unpleasant situation with the intention to make it better.
Example Sentence:
I can tell me wife is upset with me but I don’t know why, we really need to clear the air.

Soldier on

Meaning:
To continue to do an difficult task despite pain or setbacks.
Example Sentence:
I almost quit my terrible job yesterday but I decided to soldier on until I can find a better one.