ob-mōlĭor — Lewis & Short
ob-mōlĭor, ītus, 4, v. dep. (perh. not ante-Aug.).
I Lit., to push or throw up one thing before another (as a defence or obstruction):
nec in promptu erat quod obmolirentur,Liv. 33, 5, 8:
arborum truncos et saxa,Curt. 6, 6, 24.—
II Transf., to block up, obstruct:
ad munienda et obmolienda, quae ruinis strata erant,Liv. 37, 32, 7; cf. id. 33, 5.