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

一丸[ichigan] lump
丸柱[marubashira] column
丸盆[marubon] round tray
丸っこい[marukkoi] round
丸っ切り[marukkiri] completely

丸で[marude] quite
丸味[marumi] roundness
丸める[marumeru] to make round
丸め込む[marumekomu] to coax