锐不可当[ruì bù kě dāng]
词典can't be held back：锐不可当。
词典An army's attacking power cannot be checked.：锐不可当。
词典be full of fighting spirit as to be irresistible：锐不可当。
词典carry all [everything] before one
锐不可当[ruì bù kě dāng]
can't be held back; An army's attacking power cannot be checked.; be full of fighting spirit as to be irresistible; carry all [everything] before one; no force can stop ...; with crushing force:
例：以锐不可当之势
with irresistible force