"Otherwise ..."

IFNOT

Consider the phrase that introduces an alternative condition in programming or logic.

The clue "Otherwise ..." hints at a phrase meaning "if not" or "or else," which is often shortened to "if not" in casual speech. The answer "IFNOT" directly combines these words into a single term, playing on the common phrasing. It’s a straightforward abbreviation that fits the clue’s implication of an alternative condition.