the big something-o
the big (number)-o
An age ending in zero, used especially when one turns that age on one's birthday. So, you're turning the big three-o tomorrow! How are you feeling about it? My mom's going to be the big six-o this summer, so we're planning a big family vacation to mark the occasion.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.
the big — -o
used to denote an age ending in a zero, especially as marked by a landmark birthday. informalFarlex Partner Idioms Dictionary © Farlex 2017
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