一も二も無く[ichimonimonaku] unhesitatingly
一言二言[hitokotofutakoto] a word or two
一石二鳥[issekinichou] killing two birds with one stone
一二に及ばず[ichininioyobazu] right away
一姫二太郎[ichihimenitarou] It's good to have a girl first and then a boy

うり二つ[urifutatsu] as alike as two melons (two peas in a pod)
黄道十二宮[koudoujuunikyuu] twelve signs of the zodiac
二度[futatabi] again
最小二乗法[saishounijouhou] least-squares method
三十二分音符[sanjuunibuonpu] 32nd note

撥条[zenmai] spring (e.g. coil, leaf)
悪条件[akujouken] unfavorable conditions
安全保障条約[anzenhoshoujouyaku] US-Japan Security Treaty
案の条[annojou] just as one thought
一条[ichijou] one long straight object

化学兵器禁止条約[kagakuheikikinshijouyaku] chemical weapons ban treaty
仮条約[karijouyaku] provisional treaty
何条[nanjou] what street? (esp. in Kyoto and Sapporo)
箇条[kajou] items
基本条件[kihonjouken] basic conditions

鯖を読む[sabawoyomu] to manipulate figures to one's advantage
締め鯖[shimesaba] soused (vinegared) mackerel
鯖折[sabaori] forward force down
鯖節[sababushi] dried, smoked mackerel
真鯖[masaba] chub mackerel (Scomber japonicus)

胡麻鯖[gomasaba] blue mackerel (Scomber australasicus)
丸鯖[marusaba] blue mackerel (Scomber australasicus)
本鯖[honsaba] chub mackerel (Scomber japonicus)
青鯖[aosaba] mackerel (esp. the chub mackerel, Scomber japonicus)