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| keep up |
verb |
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1. transitive verb maintain present level of something: to maintain something at its present level
 Keep up the good work.
That's excellent. Keep it up.
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2. intransitive verb stay even: to go as fast or make the same progress as somebody else
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3. transitive verb maintain something in good condition: to make sure that something stays in good condition
has a beautiful home but doesn't really keep it up
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4. transitive verb not let somebody go to bed: to prevent somebody from sleeping or going to bed at night
The music from the party kept us up till dawn.
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