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)

右から左へ[migikarahidarihe] from right to left
右といえば左[migitoiebahidari] always contradicting what other people say
右往左往[uousaou] move about in confusion
左右[sayuu] left and right
左下[hidarishita] lower left

左回り[hidarimawari] counterclockwise rotation
左官[sakan] plasterer
左岸[sagan] left bank (of a river)
左記[saki] undermentioned (statement)