subcontract
Concise Oxford English Dictionary © 2008 Oxford University Press:
subcontract
▶verb /sʌbkənˈtrakt/ employ a firm or person outside one's company to do (work).
■ carry out work for a company as part of a larger project.
▶noun /sʌbˈkɒntrakt/ a contract to do work for another company as part of a larger project.'subcontract' also found in these Oxford entries:

