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

御手洗い[otearai] toilet
異洗浄[isenjou] stomach pumping
一洗[issen] thoroughly wash away
灰洗い[akuarai] scouring
乾燥洗濯[kansousentaku] dry cleaning

丸洗い[maruarai] washing a kimono (or futon, etc.) without taking it apart
再洗礼[saisenrei] baptism by sprinkling
皿洗い[saraarai] washing-up
皿洗い機[saraaraiki] dish-washer (machine)
手洗[tearai] washing one's hands