I first heard this expression as a recording at the London Underground.
It’s a safety reminder to watch out for the gap as you step between the train and the platform.
I like this expression and find it quite unique. I have to admit it’s not native to me, so I may have misused it sometimes.
Such as thinking it applies to things like gaps in relationships. Or gaps between what we are and what we want to be.
Or finding opportunities in gaps. To fill what’s missing with something good, something meaningful, something admirable.
Much ado about nothing. But when you fill it up, then nothing is not nothing at all.