Definitions of strap:

noun: whip consisting of a strip of leather used in flogging
noun: an elongated leather strip (or or strip of similar material) for binding things together or holding something in position
noun: a band that goes over the shoulder and supports a garment or bag
noun: hanger consisting of a loop of leather suspended from the ceiling of a bus or train; passengers hold onto it
verb: sharpen with a strap
Example: "Strap a razor"
verb: secure (a sprained joint) with a strap
verb: tie with a strap
verb: beat severely with a whip or rod