We need to resolve this issue for once and for all before it causes more problems.

She calls her parents once and awhile to check on them.

He visited the ruined chapel once and again during his travels, drawn to its silent beauty.

The council aimed to settle the issue once for all at the meeting.

Teachers often correct students who write once in awhile, explaining that it's a misspelling of once in a while.

Alright team, once more into the breach — we have a deadline to meet and no time to waste.

She goes to the theater once in a purple moon, when she finds a free evening.

I treat myself to a slice of cake every once in a while to celebrate small victories.

Legends say that once upon a time a great storm shaped the coastline we know today.

I visit my hometown once in a blue moon, usually only for special family events.