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

ト音記号[toonkigou] G clef
ドル記号[dorukigou] dollar sign ($)
ハ音記号[haonkigou] C clef
ブレーク信号[bureekushingou] break signal
ブロック番号[burokkubangou] block number

ヘ音記号[heonkigou] F clef
哀号[aigou] moan
暗号[angou] code
暗号化[angouka] encryption
暗号化手法[angoukashuhou] cryptography

助番[sukeban] leader of a female gang
ブロック番号[burokkubangou] block number
暗唱番号[anshoubangou] personal identification number
一貫番号[ikkanbangou] serial number
一番[ichiban] best

一番[hitotsugai] pair
一番鶏[ichibandori] first cockcrowing
一番手[ichibante] first player
一番乗り[ichibannori] leader of a charge
一番線[ichibansen] track no. 1

一貫[ikkan] consistency
一貫して[ikkanshite] consistently
一貫性[ikkansei] consistency
一貫番号[ikkanbangou] serial number
看貫[kankan] weighing

貫き通す[tsuranukitoosu] to go through
貫く[tsuranuku] to go through
貫通[kantsuu] pierce
貫徹[kantetsu] accomplishment
貫流[kanryuu] flowing through