run acrosssb
—phrasal verbwithrunverbuk/rʌn/us/rʌn/present participlerunning|past tenseran|past participlerun
informaltomeetsomeone youknowwhen you are notexpectingto
偶然遇到(某人),偶然撞见(某人)
Iranacrossseveraloldfriendswhen I went back to myhometown.我回老家时和几个老朋友不期而遇。