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

一斗[itto] 1 "to" (unit of volume, approx. 18 litres)
五斗米[gotobei] small salary
斗酒[toshu] kegs of sake
斗争[tousou] strife

不斗[futo] suddenly
分液漏斗[bunekirouto] separatory funnel
北斗七星[hokutoshichisei] the Big Dipper (asterism)
北斗星[hokutosei] the Great Bear