- [countable]
the thick main stem of a tree, that the branches grow from 树干 
an instrument made from a hollowed-out tree trunk 用挖空的树干制成的工具
Oxford Collocations Dictionaryadjective- massive
- thick
- gnarled
- …
- (North American English) (British English boot)[countable]
the space at the back of a car that you put bags, cases, etc. in （汽车后部的）行李厢 
He slammed the trunk shut. 他砰地关上了行李箱。 She popped the trunk and we tossed the stuff inside. 她打开行李箱，我们就把东西扔了进去。
Oxford Collocations Dictionaryadjective- car
- open
- pop
- close
- …
- in the trunk
- [countable]
the long nose of an elephant 象鼻 
- trunks(also swimming trunks, North American English also swim trunks)[plural]
a piece of clothing covering the lower part of the body and sometimes the top part of the legs, worn by men and boys for swimming （男式）游泳裤 
Oxford Collocations Dictionaryadjective- bathing
- swim
- swimming
- …
- pair
- [countable]
a large, strong box with a lid (= cover), used for storing or transporting clothes, books, etc. 大箱子；大衣箱 
I found the documents at the bottom of an old tin trunk in the attic. 我在阁楼上一个旧铁皮箱子的底部找到了那些文件。 She was packing her school trunk. 她正在收拾她的学校行李箱。
Oxford Collocations Dictionaryadjective- old
- tin
- wooden
- …
- pack
- unpack
- in a/the trunk
- [countable, usually singular]
the main part of the human body apart from the head, arms and legs （人的）躯干
Word Originlate Middle English: from Old French tronc, from Latin truncus.