about-turn

Short definition from Wiktionary

Noun

1. 1
   A turn of 180 degrees, typically in a military formation .
2. 2
   Total reversal of opinion or attitude .
3. 3
   Alternative spelling of about-turn.

Verb

1. 1
   To turn 180 degrees, typically in a military formation.
2. 2
   Alternative spelling of about-turn.