swap
Concise Oxford English Dictionary © 2008 Oxford University Press:
swap /swɒp/ (also swop)
▶verb (swaps, swapping, swapped) exchange or substitute. ▶noun an act of exchanging one thing for another.
– derivatives
swappable adjective,
swapper noun.
swappable adjective,
swapper noun.
– origin ME (in the sense ‘throw forcibly’): prob. imitative of a resounding blow.
'swap' also found in these Oxford entries:

