180 Definition

noun

An instance of spinning 180 degrees, so that one is facing in the opposite direction.

He did a 180 off the diving board.
Wiktionary

(figuratively) The exact opposite.

The friendly welcome was a 180 from what she had been expecting.
Wiktionary

(figuratively, by extension) A complete change of direction or opinion.

She used to like turnips, but she did a 180 and now hates them.
Wiktionary