Definitions of keep up:
- verb: prevent from going to bed at night
- verb: maintain a required pace or level
Example: "He could not keep up and dropped out of the race"
- verb: keep informed
- verb: lengthen or extend in duration or space
Example: "Keep up the good work"
- verb: keep in safety and protect from harm, decay, loss, or destruction
Example: "The old lady could not keep up the building"
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