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

一概に[ichigaini] unconditionally
一般概念[ippangainen] general idea
会社概要[kaishagaiyou] company overview
概して[gaishite] generally
概ね[oomune] in general

概括[gaikatsu] summary
概観[gaikan] general view
概況[gaikyou] outlook
概算[gaisan] approximation
概数[gaisuu] round numbers