keep up

(Английский)

  1. (transitive) To maintain; to preserve; to prevent from deteriorating or falling.
  2. (idiomatic, transitive) To continue with (work, etc).
  3. (idiomatic, intransitive) To stay even or ahead.
  4. To ensure that one remains well-informed about something.
  5. To prevent someone from going to bed or to sleep
  6. (obsolete) To use capital letters as much as reasonable.

Напротив
keep down
Этимология (Английский)

In summary

From Middle English kepen up (“to perpetuate, maintain, preserve”), equivalent to keep + up.

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