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once selca day 

once selca day is the most important day of the year. it’s a day that all onces imitate a selca of twice and post it on twitter.
nayeon - what day is it?

jeongyeon - it’s once selca day!

once thought 

It is a function to a context that was once doubted or certainty from a person's statement and theories.
Penrose Tilings were once thought as impossible shapes.
once thought by 1m1m0 September 27, 2022

once in a lifetime 

An experience so rare that it often happens only once in a person's entire lifetime. Basically, it can be seen as something that might happen only once in roughly 60 years or longer.
For some, a trip to Disney World is a once in a lifetime experience.

When a friend moves long distance, getting together with that friend for a dinner and a movie is very commonly a once in a lifetime experience.

Getting married is a once in a lifetime experience.

Once twice three times you're ladies 

How can we know what you've done,
If we can't even do what we are meant to hun,
If it was meant to be,
I wouldn't be heading out to sea!
Once twice three times you're ladies for shame on giving females a bad name.

once in 12 years 

believe it or not once in 12 years theres a leap year on monday (not including the 100 years leap year rule)
once in 12 years is 5 times every 60 years

Once Upon A

A prefix representing a kid-friendly version of a pre-existing product or concept, named after "Once Upon A Deadpool" (2018). It signifies an attempt to create a more suitable and sanitized version for children.
As YouTube Kids had been corrupted by the emerging phenomenon called Elsagate, YouTube should try another attempt to make a kid-friendly version called Once Upon A YouTube, featuring daytime TV-like censorship modeled after Disney Junior and Disney Channel.