Below are possible answers for the crossword clue One could be off or on.
11 letter answer(s) to one could be off or on
PREPOSITION
(linguistics) the placing of one linguistic element before another (as placing a modifier before the word it modifies in a sentence or placing an affix before the base to which it is attached)
a function word that combines with a noun or pronoun or noun phrase to form a prepositional phrase that can have an adverbial or adjectival relation to some other word
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