(1)突然噴火するか、強まる
(2)erupt or intensify suddenly; "Unrest erupted in the country"; "Tempers flared at the meeting"; "The crowd irrupted into a burst of patriotism"
さらに詳しく
(1)突然の流れまたは噴射で前方へ噴出する
(2)gush forth in a sudden stream or jet; "water gushed forth"
