watch one's back

:  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

:  the rear part of the human body especially from the neck to the end of the spine

:  the body considered as the wearer of clothes

:  capacity for labor, effort, or endurance

:  to, toward, or at the rear

:  in or into the past :  backward in time

:  ago

:  being at or in the back

:  distant from a central or main area

:  articulated at or toward the back of the oral passage :  formed deep within the mouth

:  to support by material or moral assistance

:  substantiate

:  to assume financial responsibility for