If not definitions

If not

1) Alternatively 2) As a backup plan 3) Backup plan lead-in 4) Barring that 5) Conditional phrase 6) Elsewise 7) Lead-in to plan B 8) On the other hand 9) Otherwise 10) Plan B lead-in 11) Should it be otherwise 12) Words before an alternative 13) Words before stating plan B 14) Words of contingency
Found on https://www.crosswordclues.com/clue/if-not

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if not

[adv] - perhaps
Found on http://www.webdictionary.co.uk/definition.php?query=if%20not

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if not

adverb perhaps; indicating possibility of being more remarkable (greater or better or sooner) than; `will yield 10% if not more`; `pretty if not actually beautiful`; `let`s meet tonight if not sooner`
Found on https://www.encyclo.co.uk/local/20974

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