ちょっと一杯[chottoippai] let's have a quick drink
ばつ一[batsuichi] being once divorced
一向[hitaburu] nothing but
サラダ一皿[saradahitosara] plate of salad

安全第一[anzendaiichi] safety first
一か八か[ichikabachika] sink or swim
一っ走り[hitoppashiri] spin (as in 'take a car for a spin')
一つ一つ[hitotsuhitotsu] one-by-one

一個[ikko] piece
各個[kakko] every one
個室[koshitsu] private room
個条[kajou] article
個人[kojin] individual

個人タクシー[kojintakushii] privately owned taxi
個人教授[kojinkyouju] private instruction
個人経営[kojinkeiei] private management
個人個人[kojinkojin] individual

一箇年[ikkanen] one year
一箇[ikko] piece
何箇月[nankagetsu] how many months?
箇月[kagetsu] (number of) months
箇条[kajou] items

三箇日[sanganichi] first three days of the New Year (January 1st to 3rd)
信仰箇条[shinkoukajou] articles of faith
二箇所[nikasho] two parts
別箇[bekko] another