まっ四角[masshikaku] square
一天四海[ittenshikai] the world
下四半期[shimoshihanki] last quarter (of the year)
弦楽四重奏曲[gengakushijuusoukyoku] string quartet
再三再四[saisansaishi] repeatedly

三寒四温[sankanshion] alternation of three cold and four warm days
四つ[yottsu] four
四つんばい[yotsunbai] (crawl) on all fours
四つ角[yotsukado] four corners
四つ足[yotsuashi] four-footed (animal)

御目出度う御座います[omedetougozaimasu] congratulations
駄目になる[dameninaru] to spoil
繋ぎ目[tsunagime] joint
軽目焼[karumeyaki] hard caramelized sugar candy
駄目押し[dameoshi] making doubly sure

一つ目[hitotsume] one-eyed
一合目[ichigoume] the start of a climb up a hill
一丁目[icchoume] Block 1
ひと目[ichimoku] (a) glance
一目惚れ[hitomebore] to be taken with someone at first sight (similar to "love at first sight", but not as strong)

ワープロ馬鹿[waapurobaka] someone whose kanji-writing ability has suffered due to overreliance on the kana-to-kanji conversion systems used to input Japanese text on a computer
鹿驚[kagashi] scarecrow
河鹿[kajika] kajika frog (Buergeria buergeri)
葦鹿[michi] eared seal (esp. the California sea lion, Zalophus californianus)
鹿児島県[kagoshimaken] Kagoshima prefecture (Kyushu)

鹿追[shikaoi] hinged bamboo water cup or trough, which makes a percussive sound periodically as it tips over
親馬鹿[oyabaka] (over) fond parents
中原の鹿[chuugennoshika] the aim (in a campaign)
馴鹿[tonakai] reindeer (Rangifer tarandus)