En korsad check är en check där utställaren dragit två parallella streck över checkens framsida. Vid inlösen av en korsad check får utbetalande bank endast betala in beloppet på kundens bankkonto, och inte betala ut kontanter.

(från blinfo.se)

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Note added at 13 mins (2011-07-29 12:36:42 GMT)
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For additional protection, a cheque can be crossed so that funds must be paid into a bank account in the name of the payee. The format and wording varies from country to country, but generally two parallel lines and/or the words 'Account Payee' or similar may be placed either vertically across the cheque or in the top left hand corner. In addition the words 'or bearer' must be not be used or crossed out on the payee line.

from http://en.wikipedia.org/wiki/Cheque