succeed in obtaining a position;
"He nailed down a spot at Harvard"
"I cannot narrow down the rules for this game"
make final; put the last touches on; put into final form;
"let's finalize the proposal"
- The cover of the box was nailed down.
- You must pin down every quotation to its author.
- You should nail down the agreement in October.
- nail down 用钉子钉住