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

安心立命[anshinritsumei] spiritual peace and enlightenment
遺命[imei] will
一所懸命[isshokenmei] very hard
一生けん命[isshoukenmei] very hard
一般命令演算機構[ippanmeireienzankikou] general instruction unit (computer)

一命[ichimei] (a) life
運命[unmei] fate
運命論[unmeiron] fatalism
延命[enmei] keeping alive longer
恩命[onmei] gracious command or words