n an imperfection in a bodily system
n a failing or deficiency
n an imperfection in an object or machine
n a mark or flaw that spoils the appearance of something (especially on a person's body)
v desert (a cause, a country or an army), often in order to join the opposing cause, country, or army
n. 缺点；瑕疵；不合格品（defect的复数）