verb
bide
BYDE/baɪd/
To wait or remain through a period of time or difficulty.
She bides her time until the right opportunity appears.

Etymology
Old English bīdan meant to stay or wait. In “bide one's time,” that idea survives as remaining patient until a suitable opportunity arrives.
In context
if there is an outbreak of fire but the enemy soldiers remain quiet bide your time and do not attack when the force of the flames has reached its height follow it up with an attack