From side to side

I think it could be either:

Which length description are you looking for?:

2-3-3

across

'from side to side' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for across that I've seen before include "Clues like this" , "Facing" , "written like this?" , "Unlike this clue" , "ax" .)

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