Like a bump on a log
Unresponsive.The boy was sitting at his desk like a bump on a log.
Like a bolt out of the blue
Suddenly and without warning.It was like a bolt out of the blue when my father said that he will change jobs.
Like a bat out of hell
With great speed and force.The boy left the theater like a bat out of hell.
Light up
To suddenly look pleased and happy.When I told my cousin about our holiday plans his face lit up.
Light out (for somewhere)
To depart quickly for somewhere.We woke up early and prepared to light out for our first day of adventure.
Light on one’s feet
To be able to move quickly and gracefully.The boxer is light on his feet and he wins many boxing matches.
Light into (something)
To devour or eat something.When we arrived home we wanted to light into our dinner immediately.
Light into (someone)
To scold someone.The woman lit into her child when he came home from school late.
(not) lift a hand
To not do anything to help anyone.My neighbor would not lift a hand to help me move.
(not) lift a finger
To not do anything to help anyone.The man is a nice person but he will not lift a finger to help anyone else.