Altar vow (3)

I think it could be either:

Which length description are you looking for?:

1,2

ido

(Other definitions for ido that I've seen before include "Obscure language" , "See 1" , "Wedding response" , "Say yes in marriage" , "a language? That's unnatural" .)

I've seen this clue in The Star Tribune and the King Feature Syndicate.

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