Synonyms for Crop up again:

• v.

  •happen again; repeat in one's mind (verb)
  • recur.
  •recur (verb)
  • revert,
  • iterate,
  • come again,
  • be remembered,
  • return to mind,
  • reiterate,
  • persist,
  • run through one's mind,
  • haunt thoughts,
  • be repeated,
  • repeat,
  • turn back,
  • come and go,
  • recrudesce.
  •reoccur (verb)
  • re-occur,
  • re-occurring,
  • re-occurred,
  • re occurs,
  • re occurred,
  • re-occurs,
  • re occur,
  • re occurring.

• Other synonyms:

  •
  • reappear.
  •recur
  • turning back,
  • turned back.
  •Other relevant words:
  • reoccur,
  • return,
  • come back,
  • resurface.

Antonyms for Crop up again:

• v.

  • recur
    stop, halt.