Lewis Short
(adverb) : ūtrŭbīdem (ūtrŏbīdem), utrubi-dem
* On both sides, on each or either side (when the two sides are spoken of): utrosque percognovi utrubidem,Plaut. Truc. 1, 2, 50 (dub.; Speng. utrosque pergnovi probe).
Charlton T. Lewis, Charles Short, A Latin Dictionary