keep one's temper

:  to retain in one's possession or power

:  to refrain from granting, giving, or allowing

:  to have in control

:  the means or provisions by which one is kept

:  one that keeps or protects: such as

:  fortress, castle

:  heat of mind or emotion :  proneness to anger :  passion

:  calmness of mind :  composure

:  state of feeling or frame of mind at a particular time usually dominated by a single strong emotion

:  to dilute, qualify, or soften by the addition or influence of something else :  moderate

:  to anneal or toughen (glass) by a process of gradually heating and cooling

:  to harden (a material, such as steel) by reheating and cooling in oil