escrow (n.)

1590s, in law, "a writing fully executed by the parties, but put into the custody of a third person to hold until the fulfilment of some condition, when it is to be delivered to the grantee;" from Anglo-French escrowe, from Old French escroe "scrap, small piece, rag, tatter, single parchment," from a Germanic source akin to Old High German scrot "a scrap, shred, a piece cut off" (see shred (n.)). The notion of a deed delivered to a third person until a future condition is satisfied led to the sense of "a deposit of money held in trust or security" (1888).