Meaning of on-again, off-again

on-a•gain off-a•gain

Pronunciation: (on'u-gen" ôf'u-gen", of'-, ôn'-), [key]
  1. being in force or inoperative by turns, esp. spasmodically and unpredictably: an on-again, off-again romance.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.