Definition of keep up phrasal verb from the Oxford Advanced Learner's Dictionary

  

keep up

 phrasal verb
phrasal verb
 
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Phrasal Verbs
if particular weather keeps up, it continues without stopping The rain kept up all afternoon.

keep up

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keep up with somebody

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keep up with something

 
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 to move, make progress or increase at the same rate as somebody/something Slow down—I can't keep up! I can't keep up with all the changes. Wages are not keeping up with inflation.
to prevent somebody from going to bed I hope we're not keeping you up.
  1. 1  to make something stay at a high level The high cost of raw materials is keeping prices up.
  2. 2  to continue something at the same, usually high, level The enemy kept up the bombardment day and night. We're having difficulty keeping up our mortgage payments. Well done!Keep up the good work/Keep it up!
  3. 3to make something remain at a high level They sang songs to keep their spirits up.
  4. 4to continue to use or practise something to keep up old traditions Do you still keep up your Spanish?
  5. 5to take care of a house, garden/yard, etc. so that it stays in good condition synonym maintain related noun upkeep
See the Oxford Advanced American Dictionary entry: keep up