1. To secure or to connect: Before Sam left the barn, he bolted the lock, or bolt, to the sliding door.
2. To depart freely: Jack could see the man bolt out the door as the owner of the house came home.

The process of shedding or casting off of the outgrown skin or exoskeleton in the process of growth; also, the cast-off skin itself: Jill read in the newspaper that some birds in her area change color during their winter molt.