You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.

Category: COLORFUL LANGUAGE 
Clue: A karate kid may aspire to this high rank, kuroi-obi in Japanese
a black belt

Category: BODY LANGUAGE 
Clue: When vou're idle or just plain bored, you do this with your pollex digits, literally or figuratively
twiddle your thumbs

Category: GOING IN FOR THE KRILL 
Clue: This krill-eater similar to the octopus has 8 arms & 2 tentacles

squid