weasel (esp. the Japanese weasel, Mustela itatsi)

mustelid (any mammal of family Mustelidae)

cut in the skin caused by a vacuum formed by a whirlwind

mythical weasel-like creatures riding on whirlwinds and inflicting sharp, painless wounds

Idiomatic expression

going round in circles; game of cat and mouse; pointless and repetitive back-and-forth

Historical term; Original meaning

itachi-gokko; Edo-period children's game in which two players alternately pinch the back of the other's hands and stack them on top of each other while saying "itachi-gokko, nezumi-gokko"

Word usually written using kana alone

Japanese marten (Martes melampus)

marten (any arboreal weasel-like mammal of genus Martes)

tiger shark (Galeocerdo cuvier)

Idiomatic expression

final emergency measure; final defence when one is cornered

ferret

polecat (Mustela putorius); ferret; fitch

Rare term

mongoose

not writing or visiting someone; road of the weasel