Traveler's checks are checks that you buy at a bank and take with you when you travel, for example, so that you can exchange them for the currency of the country that you are in.
traveler's check in British English
(ˌtrævələzˈtʃɛk)
noun
US another name for traveller's cheque
traveler's check in American English
US
a check or draft, usually one of a set, issued by a bank, etc. in any of several denominations and sold to a traveler who signs it at issuance and again in the presence of the person cashing it