(grammar) a verbal conjugation class in which the verb stem ends in s-

(Classical Japanese grammar) a verbal conjugation class in which the verb stem ends in r- with four irregular bases: -a, -i, -u, and -e

(linguistics) a specific historical consonantal shift of the Japanese language during the Heian Period, wherein many word-medial /f/ sounds changed to /w/ sounds

a journey of a thousand miles begins with a single step

(linguistics) a historical consonantal shift of the Japanese language involving the kana は/ハ (ha), ひ/ヒ (hi), ふ/フ (fu), へ/ヘ (he), and ほ/ホ (ho)