it is not brave to run away when you ought to fight

to turn against someone at the crucial hour

for time to fly or pass away quickly

feel jittery, face to turn pale

grow pale or wan, become deadly pale

in time of adversity, when times are bad

in the nick of time, just on time, just then, on cue

no one befriends you in the time of need

every thing should be ready at the proper time

timely, on time

to turn on someone at the crucial hour

stand by or be useful in time of need, helping in trouble, helping in distress