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

一匹[ippiki] one animal (small)
数匹[suuhiki] several animals
馬匹[bahitsu] horses
匹敵[hitteki] comparing with
匹夫[hippu] (humble) man

匹夫の勇[hippunoyuu] rash courage
匹夫匹婦[hippuhippu] coarse men and women
匹婦[hippu] coarse woman
匹儔[hicchuu] equal

伊達男[dateotoko] dandy
一男[ichinan] boy
下女下男[gejogenan] servants
下男[genan] manservant
寡男[yamoo] widower

間男[maotoko] married woman's secret lover
既婚男性[kikondansei] married man
貴男[anata] you (referring to someone of equal or lower status)
男気[otokogi] chivalrous spirit
好男子[koudanshi] handsome man