Marked down (2,4)

I think it could be either:

Which length description are you looking for?:

2,4

on sale

'marked down' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for on sale that I've seen before include "available in store" , "Available for purchase" .)

I've seen this clue in the Universal.

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