| 右四つ | hold in which both wrestlers obtain an underarm grip with the right hand and an overarm grip with the left |
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| 四角張る | to be angular, to be formal |
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| 左四つ | hold in which both wrestlers obtain an underarm grip with the left hand and an over-arm grip with the right |
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四辻
四つ辻 | crossroads, intersection, crossway, carrefour |
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| 六十四卦 | the 64 hexagrams (of the Book of Changes) |
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| 四周 | periphery, circumference |
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| 四姓 | varna (each of the four Hindu castes) |
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| 四人組 | the Gang of Four, quartet |
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| 四七抜き | pentatonic scale |
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| 弦楽四重奏団 | string quartet |
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| 四季報 | quarterly (journal) |
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| 四則 | four (fundamental) rules of arithmetic |
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| 四年生 | fourth-year student |
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| 四半世紀 | quarter of a century |
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| 四十路 | age forty |
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| 四女 | fourth-born daughter |
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| 四男 | fourth son |
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| 週四日 | four days a week |
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| 四人 | four people |
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| 四半期収益 | quarterly earnings |
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| 四半期収益発表 | quarterly earnings announcement |
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| 四当五落 | sleep four hours and pass, sleep five hours and fail (when cramming for university entrance exams) |
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| 四本 | four (long cylindrical things) |
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| 四神獣 | four divine beasts, guardian deities of the four cardinal points |
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| 四房 | four tassels hung above the ring |
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| 四本柱 | four posts that used to support the roof over the ring |
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| 四つ身 | kimono made for young children |
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| 四象 | four images, four symbols, four emblems, four phenomena, four phases |
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| 四書五経 | the Four Books and Five Classics of Confucianism, the Nine Chinese Classics |
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| 四夷 | the surrounding barbarians (from a Chinese perspective) |
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| 四海兄弟 | people in the whole world being all brothers, universal brotherhood |
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四季折々
四季折折 | from season to season, season by season, of each season, in each season |
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| 四十不惑 | At forty, one has no doubts. (Confucius) |
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| 二十四気 | the 24 seasonal divisions of a year in the old lunar calendar |
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| 四文字語 | four-letter word (English) |
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| 四字成句 | Chinese four-character phrase or idiomatic expression |
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| 単四 | size AAA (battery) |
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| 四則演算 | four arithmetic operations, basic arithmetic operations |
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| 四神相応 | an ideal topography for the four Taoist gods, with a river in the east, a broad avenue in the west, a basin in the south, and a hill in the north |
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| 四柱推命 | Four Pillar astrology |
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| 赤四手 | loose-flowered hornbeam (Carpinus laxiflora), akashide |
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| 四の五の言う | to grumble about something (trivial) |
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| 四分位 | quartile |
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| 四月病 | euphoria experienced by college students or workplace recruits at the beginning of school or work |
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| 四脚門 | style of temple gate featuring four supporting pillars and a gabled roof |
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| 明治十四年の政変 | the failed Meiji-14 coup of 1881 |
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| 文房四宝 | in calligraphy, the four important tools of brush, ink stone, ink stick, and paper |
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| 四段活用 | yodan verb conjugation (verb form of classical Japanese) |
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四方反鉋
四方反り鉋 | wooden plane with a convex base curved both along the direction of cutting and across the blade |
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