Ex- (former; out)
Ex-
Former, earlier; or out of.
Our ex-captain still comes to watch every match.
Ex-captain
A person who was captain before.
Vikram is the ex-captain of the school cricket team.
Exhale
To breathe out.
Inhale slowly, then exhale through your mouth.
Remember: Ex- meaning 'former' takes a hyphen (ex-student). Ex- meaning 'out' is joined to the word (exit, export, exhale).