TA 153ܐܸܙܕܲܪܟܲܠ ܠܟܠ ܛܒ̈ܬܐˀezdarkal lkl ṭb̈tˀאֶזדַרכַל לכל טבתאܐܸܙܕܲܪܟܲܠ ܠܟܠ ܛܒ̈ܬܐˀezdarkal lkl ṭb̈tˀאֶזדַרכַל לכל טבתאܐܸܙܕܲܪܟܲܠ ܠܟܠ ܛܒ̈ܬܐܐܸܙܕܲܪܟܲܠ ܠܟܠ ܛܒ̈ܬܐ: dare all the good things;JulSok 165(79):26↗ܬܥ̈ܠܐ ܫܝ̈ܛܐ ܡܙܕܪܟܠܝܢ ܠܡܪܒܥ ܥܠ ܡܪ̈ܒܘܥܝܬܗܘ݁ܢtˁ̈lˀ šÿṭˀ mzdrklyn lmrbˁ ˁl mr̈bwˁythwwnתעלא שיטא מזדרכלין למרבע על מרבועיתהוֹןܬܥ̈ܠܐ ܫܝ̈ܛܐ ܡܙܕܪܟܠܝܢ ܠܡܪܒܥ ܥܠ ܡܪ̈ܒܘܥܝܬܗܘ݁ܢtˁ̈lˀ šÿṭˀ mzdrklyn lmrbˁ ˁl mr̈bwˁythwwnתעלא שיטא מזדרכלין למרבע על מרבועיתהוֹןܬܥ̈ܠܐ ܫܝ̈ܛܐ ܡܙܕܪܟܠܝܢ ܠܡܪܒܥ ܥܠ ܡܪ̈ܒܘܥܝܬܗܘ݁ܢܬܥ̈ܠܐ ܫܝ̈ܛܐ ܡܙܕܪܟܠܝܢ ܠܡܪܒܥ ܥܠ ܡܪ̈ܒܘܥܝܬܗܘ݁ܢ: vile foxes dare to lie down in their lairs
Etymology uncertain, but compare zrgl #2 vb. "to stagger".
Perhaps the citation from Jul refers not so much to daring as to the habit of canines to strut round and round before lying down -- at least all the dogs we know do so.