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