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used to introduce another possibility （用以引出另一种可能性）或，或者，还是 Is your sister older or younger than you? 你有姐姐还是妹妹？ Are you coming or not? 你来还是不来？ Is it a boy or a girl? 是个男孩还是女孩？
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used in negative sentences when mentioning two or more things （用于否定句，提出两种或多种事物时）也不 - (also or else)
used to warn or advise somebody that something bad could happen; otherwise （用于警告或忠告）否则，不然 -
used between two numbers to show approximately how many （用于两个数字之间表示约略数目）大约 -
used to introduce a word or phrase that explains or means the same as another （用于引出解释性词语）或者说 -
used to say why something must be true （用于说明原因）不然，否则 -
used to introduce a different or opposite idea （用于引出对比的概念）
Word OriginMiddle English: a reduced form of the obsolete conjunction other (which superseded Old English oththe ‘or’), of uncertain ultimate origin.
Idioms
or so
or somebody/something/somewhere | somebody/something/somewhere or other
- (informal)
used when you are not exactly sure about a person, thing or place （表示对人、事、地点不太有把握） He's a factory supervisor or something. 他是工厂监督一类的人吧。 ‘Who said so?’ ‘Oh, somebody or other. I can't remember who it was.’ “这是谁说的？” “啊，某一个人吧，我记不清是谁了。”