底线 Traditional form: 底線 Pinyin (reading): dǐxiàn Definitions: bottom line; the limit of what one is prepared to accept (sports) baseline (sewing) under thread spy; informer; plant Characters: 底 - bottom, underside; below, underneath 线 - line, thread, wire; clue, trail Traditional characters: 底 - bottom, underside; below, underneath 線 - line, thread, wire; clue, trail