sous-traiter

CONT: sous-traiter les travaux de plomberie d'un groupe scolaire.

CONT: ... the owner may limit the extent of work done by ""subs"". But the trend is to subcontract more of the specialized operations.
CONT: for ""sub out"" : Usually the general contractor handles the concrete, masonry, and carpentry work, and ""subs out"" - that is, lets subcontracts to others - the excavation, the pile driving, and many other jobs done by skilled trades.
OBS: for ""sub out"" : This is presumably jargon. The term is not listed in standard dictionaries.