on and off

on and off

Irresolute; wavering in certainty or constancy; inconsistent. Commitment from the board regarding the merger of the two companies has been off and on since the plan was first proposed. Mike and I were pretty serious for about a year, but our relationship has been off and on ever since we graduated from high school.
See also: and, off, on
Farlex Dictionary of Idioms.

on and off

 and off and on
occasionally; erratically; now and again. I feel better off and on, but I'm not well yet. He only came to class on and off.
See also: and, off, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

on and off

intermittently; now and then.
See also: and, off, on
Farlex Partner Idioms Dictionary

on and off

Intermittently.
See also: and, off, on
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • off again, on again
  • on again
  • on again, off again
  • washy
  • wishy
  • be wishy-washy
  • wishy-washy
  • have half a notion to (do something)
  • have half a notion to do
  • notion