putting on armor and helmet; wearing armor
Dated term for donning armor, especially in historical or military contexts. Not used in modern everyday language.
Before battle, the samurai put on his armor and helmet to protect himself.
In the former Japanese military, the gas mask was used to protect soldiers from poison gas.
被甲 is an old military term for a bulletproof jacket made of cupronickel.
Compound of 被 (hi, 'cover' or 'put on') and 甲 (kou, 'armor' or 'helmet'). The exact historical derivation is uncertain, but the kanji directly reflect the meaning of donning protective gear.