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]
(..) PacBell also, correct? - Yes, she does. - And you guys are both... ...looking to retire at the same time? We'd like to retire and maintain our lifestyle... ...without paying a lot of taxes. So basically, you want nobody's hands in your pockets but your own? Are you familiar with (..)2006 The Pursuit of Happyness