or goal post
a post supporting a crossbar and, with it, forming the goal on a playing field in certain sports, as football.
Origin of goalpost
First recorded in 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
either of two upright posts supporting the crossbar of a goal
move the goalposts to change the aims of an activity to ensure the desired results
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012