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do a 180
1. Literally, to begin moving in the opposite direction. (If one physically turns 180 degrees, one will then be facing the opposite direction.) I was going to go to the park, but when I saw those dark clouds roll in, I did a 180 and headed back home.
2. To make a big change in one's position, opinion, lifestyle, etc. A: "Can you believe that Sam quit his job at the firm?" B: "No, he really did a 180 on being a paralegal!"
See also: 180
do an about-face
To suddenly and completely turn or change one's direction. This phrase can describe one's physical movement or a change in concept. She did an about-face and walked back up the steps once she saw that the subway wasn't running. Based on the reactions we got from test audiences, we need to do an about-face with the movie's plot.
do a one-eightyand turn one hundred and eighty degrees
1. Lit. to turn around and go in the opposite direction. When I hollered, the dog did a one-eighty and headed back to its own yard.
2. Fig. to radically reverse a decision or opinion. His political philosophy turned one hundred and eighty degrees when he grew a little older.
Sl. to throw something away. Let's eighty-six this stew and go out and get some decent pizza.
do an about-face
Also, do a flip-flop or one-eighty . Reverse one's opinion or course of action. For example, The board did an about-face on acquiring more land, or We expected Dad to do a flip-flop concerning our vacation plans, or They had relied on Jim to vote for Harry, but he did a one-eighty and cast his vote for the incumbent . The first term, alluding to the army command to turn around, dates from the first half of the 1900s, and the variants from the second half of the 1900s (the last refers to a 180-degree change of direction).
n. a piano. (Pianos have eighty-eight keys.) Sam can really beat the eighty-eight.
tv. to dispose of someone or something; to nix someone or something. He wants $400? Eighty-six that! We can’t afford it.