Definitions from Wiktionary (heartbreaker)

▸ noun:  (agent noun) Someone or something that breaks someone's heart, as:
▸ noun:  A person, usually attractive, who flirts with or otherwise enamours another person, but does not reciprocate their love.
▸ noun:  Something that causes sorrow, grief or extreme disappointment.
▸ noun:  (sports) A match which ends in defeat for a promising player or team.
▸ noun:  (dated) A curl or lovelock.

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