let sb/sth go | ˌlet ˈgo (of sb/sth)
1.
to stop holding sb/sth :
Don't let the rope go.
Don't let go of the rope.
Let go! You're hurting me!
2.
to give up an idea or an attitude, or control of sth :
It's time to let the past go.
It's time to let go of the past.