應ㄧㄥˋyìng援ㄩㄢˊyuán

接應救援。《金史·卷一一七·王賓傳》：「聞亳州王進反正，制旨以喜住為振武都尉，將兵三千應援。」

英(originally) to provide assistance, (more recently) to show one's support (for a singing idol etc)