Definition of “once in a while”

Sometimes on Saturdays Rita would ride with him, keep him company, and once in a while she'd help him serve a paper.

They don't need much care, just some food and a walk once in a while , but they give so much affection.

Abramowitz updates his list to keep up with player movement and, once in a while , adds someone who was missed in his initial research.

They are seeing spotty economic reports, and good ones once in a while.

And they just understand why, every once in a while , I will need to pull back and take some deep breaths.