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

一籌[icchuu] (a) point
一籌を輸する[icchuuwoyusuru] to be inferior to

籌木[chuugi] small block of wood used to clean one's buttocks after defecating
算籌[sanchuu] sticks used for counting