Lose momentum (6)

I think it could be either:

Which length description are you looking for?:

2,4

falter

'lose momentum' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for falter that I've seen before include "flag" , "Hesitate, waver" , "Hesitate, be uncertain" , "Stumble, hesitate" , "Be hesitant" .)

I've seen this clue in The Independent and The Times.

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