This means she will do something for me, if I do something helpful for her in exchange.

VOA: special.2010.01.24

"I don't remember any one in particular. I mean,they're pretty much the same, like we'll just celebrate, exchange cards, may go out to dinner.

VOA: special.2010.02.08

"I happen not to know the answer." Some analysts think Amiri's return could mean an exchange for Americans held in Iran.

VOA: standard.2010.07.13