ū^trŭbīdem — Lewis & Short
ū^trŭbīdem (ū^trŏbīdem), adv.utrubi-dem,
I 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).