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

に応じて[nioujite] depending on
ステップ応答[suteppuoutou] step response
一応[ichiou] once
陰性反応[inseihannou] negative reaction (in patient)
応える[kotaeru] to respond

応じて[oujite] in proportion to
応じる[oujiru] to respond
応援[ouen] aid
応援歌[ouenka] rooters' song
応援団[ouendan] cheering party