Persistently bothering, annoying, or attacking someone or something repeatedly; constantly pestering or harassing.
From Old English 'hergian' meaning to raid or plunder, related to 'here' (army). The word evolved to mean persistent bothering or harassment, as if constantly raiding someone's peace of mind.
The original meaning was actually about Viking-style raids, so 'harrying' someone literally meant 'raiding them repeatedly'—which is a vivid way to picture how annoying constant pestering can feel!
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