Definition of keep up phrasal verb from the Oxford Advanced American 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 (with somebody/something)

 
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to move, make progress, or increase at the same rate as someone or something Slow down—I can't keep up! I can't keep up with all the changes. Salaries are not keeping up with inflation.

keep somebody up

 
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to prevent someone from going to bed I hope we're not keeping you up.

    keep somethingup

     
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  1. 1to make something stay at a high level The high cost of raw materials is keeping prices up.
  2. 2to 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 practice something to keep up old traditions Do you still keep up your Spanish?
  5. 5 to take care of a house, yard, etc. so that it stays in good condition synonym maintain related noun upkeep
See the Oxford Advanced Learner's Dictionary entry: keep up