mass noun
1
- informal old or discarded articles that are considered useless or of little value〈非正式〉垃圾, 破烂, 废旧杂物。
1.1
- worthless writing, talk, or ideas胡说八道, 毫无价值的作品（或想法）：
I can't write this kind of junk.
我不能写这种乌七八糟的东西。
1.2
- Finance junk bonds【财政】垃圾债券。
2
- informal heroin〈非正式〉海洛因, 吗啡。
3
- the lump of oily fibrous tissue in a sperm whale's head, containing spermaceti（含有鲸脑油的）抹香鲸头部纤维组织。
with obj.
- informal discard or abandon unceremoniously〈非正式〉随便丢弃, 扔掉：
sort out what could be sold off and junk the rest.
拣出可以变卖的物件, 把其余的扔掉。
词源
late Middle English (denoting an old or inferior rope)： of unknown origin. Sense 1 dates from the mid 19th cent.