1 tr to maintain (prices, one's morale) at the present level
2 intr to maintain a pace or rate set by another
3 intr; often foll by: with to remain informed
to keep up with technological developments
4 tr to maintain in good condition
5 tr to hinder (a person) from going to bed at night
the excitement kept the children up well past their bedtime
keep it up to continue a good performance
keep one's chin up to keep cheerful under difficult circumstances
keep one's end up to maintain one's stance or position against opposition or misfortune
keep up with to remain in contact with, esp. by letter
to keep up with (the Joneses)
Informal to compete with (one's neighbours) in material possessions, etc.
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"