What is "pin down"

vb. 1 To attach or secure with pins. 2 (context idiomatic English) To identify something (e.g. a decision or plan) clearly or specifically. 3 (context wrestling English) To hold the opponent back-first so both his or her shoulders touch the mat. 4 (context idiomatic English) To corner somebody in order to get a firm answer.

1. v. define clearly; "I cannot narrow down the rules for this game" [syn: peg down, nail down, narrow down, narrow, specify]

2. attach with or as if with a pin; "pin up a picture" [syn: pin up]

3. define clearly; "Can you pin down the difficulties" [syn: narrow down]