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

悪党[akutou] scoundrel
一国一党主義[ikkokuittoushugi] one-party system
一党[ittou] party
一党一派[ittouippa] party
一党支配[ittoushihai] one-party rule

我党[wagatou] my party
甘党[amatou] (someone with a) sweet tooth
挙党[kyotou] entire (political) party
共産党[kyousantou] Communist Party
共産党細胞[kyousantousaibou] communist cell