"left turn : (idiomatic) An unexpected change from the way things seemed to be going. left turn..."

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left turn : (idiomatic) An unexpected change from the way things seemed to be going.
left turn interj

(chiefly military) A command to a soldier or other person who is marching: turn ninety degrees to your left!
left turn v

(intransitive, chiefly military) To turn ninety degrees to one’s left, especially in response to a military command while marching.

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- https://en.wiktionary.org/wiki/left_turn#English

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