helmet (of a warrior);  headpiece
 to accept one's inferiority;  to take one's hat off to someone;  to give up;  to surrender;  to strike one's colors
 Kabutochō (neighbourhood of Nihonbashi, Tokyo, where the Tokyo Stock Exchange is located);  Tokyo Stock Exchange
 aconite (esp. species Aconitum japonicum);  wolfsbane;  monkshood;  traditional bugaku hat
 do not let your guard down after a victory; (lit.) tighten the strings of your helmet after winning
 broiled fish head (esp. sea bream)
 inside of a helmet;  hidden circumstances
 rhinoceros beetle (esp. the Japanese rhinoceros beetle, Trypoxylus dichotomus)
 large-headed midnight fish (Poromitra crassiceps);  armored fish;  armoured fish
 tadpole shrimp (Triopsidae spp.);  shield shrimp
 Hercules beetle (Dynastes hercules)