keep watch

:  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

:  to keep vigil as a devotional exercise

:  to be awake during the night

:  to be attentive or vigilant

:  the act of keeping awake to guard, protect, or attend

:  the state of being wakeful

:  a wake over a dead body