spearhead; tip of a spear
Refers to the pointed head of a spear. Can also be used figuratively for the forefront of an attack or movement.
槍先を研ぐ。
Sharpen the spearhead.
彼の部隊は攻撃の槍先となった
His unit became the spearhead of the attack.
Compound of 槍 (やり, 'spear') and 先 (さき, 'tip, point').