IPA: //bɪˈsɛtmənt//
KK: /bɪˈsɛtmənt/
The condition of being surrounded or attacked by problems or difficulties.
The besetment of the town by floods caused many families to evacuate.
Besetment is formed from "be-" (meaning about or around) and "set" (from Old English "settan", meaning to place or put). The suffix "-ment" (meaning the action or result of) indicates the action of being placed around or surrounded. Thus, besetment refers to the state of being surrounded or troubled by difficulties or problems.
Think of being 'placed around' ('be-') by troubles or challenges, which is what besetment means.