Plural form of 'besetter'; multiple people or things that persistently trouble or surround.
From 'besetter' + '-s' (regular English plural marker). The double suffix structure '-er' (agent) + '-s' (plural) follows standard English pluralization patterns established since Old English.
Regular plurals with '-s' seem simple, but English also has hundreds of irregular plurals like 'child/children' and 'foot/feet'—remnants showing that English was much more grammatically complex before it started regularizing!
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