half-jacketWiktionary 原文英美构词拆解half-前缀+jacket词干half-half or partial; not complete · Used before brother, sister, uncle, aunt, and so forth, to indicate that the person being identified is related only through one parent, grandparent, and so forth, rather than two.词源说明From half- + jacket.释义名词noun1A short coat or jacket.2(firearms) A short bullet jacket which leaves some of the bullet in contact with the bore.