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When Person A has a crush on Person B but they do not act on it because Person B is in a relationship with someone else. If Person B gets out of the relationship, the crush no longer becomes "dormant"; Person A can act on the crush by flirting, dating, etc.
Kate: "So does Peter have a girlfriend?"
Jane: "Yeah. But if they ever broke up, Emily would be all over him the second it happened. She has such a dormant crush on him."
by arandomchick5678 December 07, 2013