赤

red nose

Idiomatic expression

to be meant for each other (of a man and woman); to be connected through fate; to be destined to marry (each other); to be tied by the red string (of fate)

red light; stop light; danger signal

red ant

red meat; reddish meat

(small) red dragonfly

darter (any dragonfly of genus Sympetrum, esp. the autumn darter, Sympetrum frequens); meadowhawk

infrared data communication

deficit operation; operating at a loss; being in the red

the Red Peril

Organization name

Akaihane (fund-raising organisation for welfare services); Red Feather

yak hair dyed red; red hair

frizzled fake hair; curly fake hair

Astronomy

red giant (star)

red cloud

comet

Sovietize; Sovietise; turning red; become communistic

great shame (endured in the public eye); deep embarrassment; profound humiliation; utter disgrace

aka-e; late 19th century woodblock prints, using imported aniline dyes

red painting on ceramics

Food, cooking

red paper restaurant lantern

cheap eating and drinking place

the reds; reddish colors

blood clam (Scapharca broughtonii); ark shell

akabeko; toy from Fukushima prefecture in the shape of a red cow, also used as a talisman against smallpox

red gate (esp. at Tokyo University)

red tide

Food, cooking

dark-brown miso paste

red tag (esp. one attached to sold goods or discounted products); red label

Card games

swords (playing card suit in traditional Japanese gambling decks)