IPA: /bɪˈliːɡər/
KK: /bɪˈliːɡər/
To trouble or annoy someone repeatedly; to surround or besiege a place with troops.
The town was beleaguered by enemy forces for several weeks.
Past: beleaguered
Past Participle: beleaguered
Beleaguer is formed from "be-" (meaning about or around) and "leaguer" (from Middle Dutch *leger*, meaning camp or siege). The word describes the act of surrounding or besieging a place, as if encamping around it.
Think of being 'surrounded' ('be-') by a 'camp' ('leaguer') — that's why beleaguer means to besiege or trouble someone.