Pronunciation: (bi-set'),[key] —v.t.,-set, -set•ting. 1. to attack on all sides; assail; harass: to be beset by enemies; beset by difficulties. 2. to surround; hem in: a village beset on all sides by dense forest. 3. to set or place upon; bestud: a gold bracelet beset with jewels. 4. Naut.to surround (a vessel) by ice, so that control of the helm is lost.