S: (v) exchange, change, interchange (give to, and receive from, one another) "Would you change places with me?"; "We have been exchanging letters for a year"
S: (v) sell (exchange or deliver for money or its equivalent) "He sold his house in January"; "She sells her body to survive and support her drug habit"
S: (v) cash, cash in (exchange for cash) "I cashed the check as soon as it arrived in the mail"
S: (v) redeem (to turn in (vouchers or coupons) and receive something in exchange)
S: (v) substitute, sub, stand in, fill in (be a substitute) "The young teacher had to substitute for the sick colleague"; "The skim milk substitutes for cream--we are on a strict diet"