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to know
[VERB] MAIN VERB
1.1
to be completely certain about something
2.1
to be able to identify a particular person or thing
2.2
to be able to distinguish a particular person or thing from another
2.3
to have learned something such as a skill and be able to use it
2.4
to perceive someone or something as a person or thing with particular qualities
2.5
to use a specific title or name for people or things
2.6
to have experience of something, especially a certain feeling or situation
3
to have sex with someone
Examples
1. The old man knew every part of the wood.
2. The tall dude in our class knows a lot about space.
3. Always know the location of the nearest emergency exit.
4. The professor knew his subject from the ground up.
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