nail down, nail, peg (verb)

succeed in obtaining a position

"He nailed down a spot at Harvard"

pin down, peg down, nail down, narrow down, narrow, specify (verb)

define clearly

"I cannot narrow down the rules for this game"

finalize, finalise, settle, nail down (verb)

make final; put the last touches on; put into final form

"let's finalize the proposal"

nail down (Verb)

to attach with nails

nail down (Verb)

to make something (e.g. a decision or plan) firm or certain