in a while

At first borrowing from an online lender was just a once-in-a-while habit that started in early 2009.

Had a passel o' sleigh-bells they'd ring ever' onc't-in-a-while, and it sounded purty—shore!

And the wind blowed in so they had to hold their hats afore the candles, and then onc't-in-a-while they'd git sluffed out.

I would oil and grease all the daily, weekly, and monthly, and even the once-in-a-while places.