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

一升[isshou] unit of old Japanese liquid measurement
一升壜[isshoubin] 1 sho bottle (1.8 litres)
升目[masume] measure
升席[masuseki] tatami "box seat" for four people at sumo, kabuki, etc.
升形[masugata] square (shape)

升遷[shousen] rising up
升酒[masuzake] alcohol (esp. sake) served in a small wooden box
升売り[masuuri] selling something by the boxful (in a wooden masu box)
蓮華升麻[rengeshouma] false anemone (Anemonopsis macrophylla)