Plural of heaver; multiple people or things that heave.
From 'heaver' + '-s' (regular English plural suffix). This is the standard regular pluralization of the agent noun 'heaver.'
Regular plurals with '-s' are so common we barely notice them, but they're the result of centuries of sound changes—Old English had complex plural systems that simplified into this one '-s' sound, making English much easier to learn!
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