To keep up

Related to To keep up: keep apart, keep down, keep under
To maintain; to prevent from falling or diminution; as, to keep up the price of goods; to keep up one's credit.
To maintain; to continue; to prevent from ceasing.
- Locke.
to remain unsubdued; also, not to be confined to one's bed.

See also: Keep, Keep, Keep

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
But it is definitely a major source of motivation for me - we have to keep up with it as the events get faster, keep improving.
With the balls coming in from all angles I was spinning around like a headless chicken trying to keep up with where the next pass was coming from.
Mrs Ronaldo took nine hours to keep up the ball 55,187 times.