Nail down Definition 1 of 3Pro Tip 1/3Commitment impression Conveys a sense of finalizing with strong commitment or certainty. Once we nail down the contract terms, we can proceed. Pro Tip 2/3Decision making Used when decisions are being made, especially in planning or negotiating. We need to nail down the venue before we send out invitations. Pro Tip 3/3Final stages Implies that discussions or uncertainty are coming to an end. Are we ready to nail down the agenda for the event?