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

一旬[ichijun] ten days
下旬[gejun] month (last third of)
五旬節[gojunsetsu] pentecost
旬外れ[junhazure] off-season

旬刊[junkan] published every ten days
旬月[jungetsu] month and ten days
旬日[junjitsu] ten-day period
旬報[junpou] ten-day report