五十路

/isodi/ → /isozi/. Shift from earlier いそち (isochi),^[1] which is from Old Japanese, a compound of 五十 (iso, “thirty”) +‎ ち (chi, a suffix derived from つ (tsu), an Old Japanese counter). The -chi changes to -ji as an instance of rendaku (連濁).

• (Tokyo) いそじ [ìsójí] (Heiban – [0])^[1]
• (Tokyo) いそじ [ìsóꜜjì] (Nakadaka – [2])^[1]
• IPA^(key): [iso̞ʑi]

五(い)十(そ)路(じ) • (isoji) ^{←いそぢ (isodi)?}

1. (uncommon) fifty
2. (uncommon) fifty years of age