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verb with object

trouble or annoy (someone) with frequent or persistent requests or interruptions:

｟くだけて｠ «…で» …をしつこく悩ます［困らす, 苦しめる］ «with» ; «…を» 〈人〉にしつこくせがむ «for» ; 〖～ A to do〗 A〈人〉に…してくれとしつこくせがむ

e.g. she constantly pestered him with telephone calls.

pesterer noun

mid 16th century (in the senses ‘overcrowd (a place)’ and ‘impede (a person)’): from French empestrer ‘encumber’, influenced by pest. The current sense is an extension of an earlier use, ‘infest’, referring to vermin.