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

へし折る[heshioru] to smash
一折り[hitoori] one box
右折[usetsu] turning to the right
右折禁止[usetsukinshi] No Right Turn!
我を折る[gawooru] to concede a point

解折[kaiseki] analysis
回折[kaisetsu] diffraction
回折格子[kaisetsukoushi] (diffraction) grating
曲折[kyokusetsu] windings
九折[kyuusetsu] many turns (in a road)