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

一旦[ittan] once
元旦[gantan] New Year's Day
旦那[danna] master (of a house, shop, etc.)
巴旦杏[hatankyou] plum
文旦[buntan] shaddock

旦つく[dantsuku] husband
命旦夕に迫る[meitansekinisemaru] to be on the brink of death
旦夕[tanseki] on the brink of
若旦那[wakadanna] young master
大旦那[oodanna] master