Annoyed or bothered someone repeatedly with unwanted requests or actions.
From Old French 'pestrer' meaning 'to trouble or harass,' possibly influenced by 'pest' (a harmful creature). The word originally meant to physically bother someone like a pest would.
Interestingly, 'pester' used to literally mean to make something a pest or nuisance, but now it's more about the emotional annoyance of repeated small botherings rather than one big problem.
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