Meaning of “dos” in the English Dictionary

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"dos" in British English

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dosnoun [ plural ]

uk /duːz/ us /duːz/
dos and don'ts

also do's and don'ts rules about actions and activities that people should or should not perform or take part in:

The teacher spent ten minutes explaining all the dos and don'ts in the classroom..

DOSnoun [ U ]

uk /dɒs/ us /dɑːs/ trademark

abbreviation for disk operating system: a type of operating system for computers

(Definition of “dos” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"DOS" in Business English

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DOSnoun [ U ]

uk /dɒs/ us

IT abbreviation for disk operating system: software that controls a computer system and manages the other programs, used mainly in older computers

(Definition of “DOS” from the Cambridge Business English Dictionary © Cambridge University Press)