He 'kept/maintained his cool' [=he didn't get angry or upset] even though it was clear that he was being unfairly treated.
He was struggling to 'maintain his cool/composure'. [=he was struggling not to become angry or upset]
They barely had enough food to 'maintain life'. [=to make it possible for life to exist or continue]
(..) This should make one hell of a story. Goodbye. I'm just saying it's apples and oranges. Listen, I maintain, if... if... if I want pizza, - I go to a pizza place. - Yeah. If I want Thai, I go... (..)2013 TvShow: Breaking Bad Title: Felina Season: 5 Episode 16