וְה֤וּא יָצָא֙ וַעֲבָדָ֣יו בָּ֔אוּ וַיִּרְא֕וּ וְהִנֵּ֛ה דַּלְת֥וֹת הָעֲלִיָּ֖ה נְעֻל֑וֹת וַיֹּ֣אמְר֔וּ אַ֣ךְ מֵסִ֥יךְ ה֛וּא אֶת־רַגְלָ֖יו בַּחֲדַ֥ר הַמְּקֵרָֽה׃
Quando uscì, vennero i suoi servi; e videro, ed ecco, le porte della camera superiore erano chiuse; e loro dissero:'Sicuramente si sta coprendo i piedi nell'armadietto della camera fredda.'
Rashi on Judges
As he left. Ehud left, and Eglon's servants came.
Metzudat Zion on Judges
It is a euphemism for reliving himself as an Samuel 1:24:3 "And Saul came to relive himself." Its named this based on the way that he is sitting down and facing. To shut in and to cover his legs because of modesty.