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

サンプリング周波数[sanpuringushuuhasuu] sampling frequency
一周忌[isshuuki] first anniversary of death
一周期[isshuuki] period (in astronomy)
一周年[isshuunen] one full year
円周[enshuu] circumference

円周率[enshuuritsu] Pi (3.1415926..)
外周[gaishuu] outer circumference
基本周波数[kihonshuuhasuu] fundamental frequency
月経周期[gekkeishuuki] menstrual cycle
周章てる[awateru] to become confused (disconcerted, disorganized, disorganised)

御巡りさん[omawarisan] policeman
一巡[ichijun] beat
乙巡[otsujun] second-class cruiser
仮装巡洋艦[kasoujunyoukan] merchant cruiser
血の巡りが悪い[chinomegurigawarui] dim-witted

血の巡りの悪い[chinomegurinowarui] dim-witted
狐疑逡巡[kogishunjun] being in doubt and unable to decide
交通巡査[koutsuujunsa] traffic officer
甲巡[koujun] armored cruiser
思い巡らす[omoimegurasu] to think over