on; on top; upon; first (of two parts); previous or last (week etc); upper; higher; above; previous; to climb; to go into; above; to go up; to attend (class or university); third tone of putonghua[cedict]
襲擊
xí jīㄒㄧˊ ㄐㄧ
an attack (esp. surprise attack); raid; to attack[cedict]