the.com/blowfish

a delicacy that doubles as a death sentence if the chef's hands ever tremble.

means A fish of the pufferfish family that inflates itself into a spiny ball when threatened, and whose flesh and organs carry a deadly toxin yet are eaten as a prized (and risky) delicacy.

from A plain English compound, blow + fish, naming the creature for its party trick: gulping water or air to balloon up to several times its size. The 'blow' here is the same old word — from Old English blawan, 'to puff or breathe out' — that gives us bellows and blowing up a balloon. English also borrows the Japanese fugu for the dish, but blowfish stays charmingly literal: the fish that blows itself up.

toxin
Carries tetrodotoxin, 1,200 times deadlier than cyanide
no cure
There is no known antidote, only luck
chef license
Japanese cooks train years for fugu certification
inflation trick
Gulps water to balloon and choke predators
smart for fish
Males carve elaborate sand circles to woo mates
for instance

blowfish cipher — cryptographic algorithm designed by bruce schneier in 1993 for data encryption

pufferfish — marine and freshwater fish species containing tetrodotoxin, found in indo-pacific regions

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