上阵

上阵	shàng zhèn	to go into battle
上	shǎng	used in 上声
上	shàng	(bound form) up; upper; above; previous / first (of multiple parts) / to climb; to get onto; to go up / to attend (class or university) / (directional complement) up / (noun suffix) on; above
阵	zhèn	disposition of troops / wave / spate / burst / spell / short period of time / classifier for events or states of short duration