(用红线)划去;取消 red line n (ice hockey rink marking) (冰球)红线 red line [sth] vtr (establish safe maximum speed)为...设置限速 red line [sth/sb] vtr figurative (mark [sb/sth] for cancellation) (用红线)划去 red line [sth] vtr (cause plane to be grounded)让...安全降落 red ...