verb
1.
Synonyms: trade 1, bargain, barter, swap, traffic, truck
2.
to give up, taking in return something else
exchanged his uniform for civilian clothes
Synonyms: change, substitute, swap, switch, trade; compare trade 1
Related Word: displace, replace
3.
to give and receive reciprocally
exchanged a few words with her neighbor
Synonyms: bandy, interchange
Related Word: pay back, reciprocate
Idioms: give as much as one takes, give tit for tat, return the compliment