also: しらは
noun
drawn sword; naked blade
Refers to an unsheathed sword, often in dramatic or literary contexts. The reading しらは is rarer and carries a slightly more classical feel.
敵は白刃を抜いて迫ってきた。
The enemy approached with drawn swords.
白刃の下をくぐり抜ける。
To pass under a naked blade (i.e., to face a life-threatening situation).
抜き身 also means a drawn or unsheathed blade, but is more concrete and less literary than 白刃.
Compound of 白 (white, bare) and 刃 (blade), literally 'white blade', referring to the bare steel of an unsheathed sword.