אֱדַ֤יִן מַלְכָּא֙ זִיוֺ֣הִי שְׁנ֔וֹהִי וְרַעיֹנֹ֖הִי יְבַהֲלוּנֵּ֑הּ וְקִטְרֵ֤י חַרְצֵהּ֙ מִשְׁתָּרַ֔יִן וְאַ֨רְכֻבָּתֵ֔הּ דָּ֥א לְדָ֖א נָֽקְשָֽׁן׃
Тогда король'Его лицо изменилось в нем, и его мысли испугали его; и суставы его чресла были ослаблены, и его колени бились один против другого.
Ibn Ezra
[Daniel 5:6] And the joints of (וְקִטְרֵ֤י - v'kitrei): [This refers to] the ligaments/joints (lit. bindings - קִשׁוּרֵי - kishurei) of his loins; they were almost loosened/untied (מֻתָּרִים - mutarim).
Rashi
and the belts of his loins became untied The belts of his loins opened because his loins were emptying out of fear, and his belt opened.