'goal post' definitions:

Definition of 'goal post'

From: GCIDE

goalpost \goalpost\, goal post \goal post\, n. (Sport) One of two posts supporting a crossbar which forms a goal[3], especially in American football; also, in football the entire structure consisting of the posts, crossbar, and two uprights. To score a goal by kicking the football, the ball must pass above the crossbar and between the vertical lines formed by the uprights. [PJC]