expression / noun:

• one's only good set of clothes (suit, kimono, etc.) - obscure term ➜ 一帳羅【いっちょうら】

noun:

• one red flower standing out in a sea of green vegetation; one item of quality standing out among many; one woman among many men - four character idiom

noun:

• one clap
• one beat
• one mora (taken as a unit of time)

expression:

• (when) danger threatens; should an emergency occur - four character idiom

ichidan verb:

• to give a signed statement or an IOU

noun:

• primary auditory cortex

noun:

• evanescent glory; passing prosperity - four character idiom

expression / ichidan verb:

• to provide against contingencies

expression / noun:

• page in the history books; historical (event); old news

noun:

• all-or-nothing gambler; power hitter (baseball); slugger; one hit wonder (e.g. in music)

noun / ~する noun:

• the breakup (dispersal) of a family - four character idiom

noun:

• one reed
• boat

noun:

• transient window - IT term

noun:

• person who is ready to comment on every subject; ready critic - four character idiom

noun / ~の noun:

• the two views (of an object) referring to the same thing; being inseparable like the two sides of an object; two sides of the same coin - four character idiom

noun:

• tension and relaxation - four character idiom

noun:

• first-base line - Baseball term

expression:

• tread on a worm and it will turn; even a tiny bug will defend itself; even the weakest and smallest beings have their own wills, so do not make light of them - proverb

noun:

• one man company

expression / noun:

• One China (policy)

noun:

• coincident-current selection - IT term

noun:

• one horseman

noun:

• first memory

noun:

• ichidan verb conjugation - Linguistics term ➜ 五段活用【ごだんかつよう】・一段動詞【いちだんどうし】

noun:

• pair (esp. of folding screens) ➜ 一対