turn ‧ key /ˈtɜːnkiː $ ˈtɜːrn-/ BrE AmE adjective [only before noun]
ready to be used immediately:
the development and sale of turnkey systems for telecommunications customers
turn ‧ key /ˈtɜːnkiː $ ˈtɜːrn-/ BrE AmE adjective [only before noun]
ready to be used immediately:
the development and sale of turnkey systems for telecommunications customers
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012