To dive or thrust something suddenly and forcefully into something else, or to fall rapidly downward.
From Old French 'plongier', derived from Latin 'plumbum' (lead), referencing how lead sinkers plunge through water. The '-es' forms the third-person singular present tense.
The word 'plunge' literally originated from lead weights sinking—ancient Romans and fishermen understood that heavy objects behave predictably, making 'plunge' one of the few words whose etymology reveals a physics lesson.
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