安分守己
Know one's distance.
Know where to draw a line.
Mind one's own business.
eg:John knows his distance and never puts his finger in other person's pie.
中英俚語俗語來源:蘇軾詩:“胡不安其份,但聽物所誘。”
同義詞:循規(guī)蹈矩 Walk the chalk.
反義詞:橫行無忌 Throw one's weight about.