six o'clock noun 4adjective 1 noun4 •The start of the seventh hour of the day; 6:00 a.m. (06:00).The breakfast buffet opens at six o'clock (= "The breakfast buffet opens at 6:00 a.m."). •The start of the nineteenth hour of the day; 6:00 p.m. (18:00).The next train comes at six o'clock (= "The next train comes at 18:00"). •(informal) A position behind (horizontal clock orientation) or below (vertical clock orientation) (from the location of the 6 mark on a clock face)We've got some bogeys at six o'clock.You've got a bogey on your six o'clock. •A pose in which the lower leg and raised upper leg form a vertical line. adjective1 •(US) Straight up and down, without curves, like the hands of a clock.Rena Mae was still an attractive woman, but now she was considered a six o'clock woman instead of a woman with big hips, […] — 2011
