prep. as, like
David Salo suggested (SG/226) that this may be a cognate of Q. ve¹ “as, like” plus a form of the definite article, having the sense “as in the [Shire-reckoning]”. This seems to me to be more plausible than Carl Hostetter’s theory connecting it to the root √MI/IMI “in” (VT31/19-20) via a the strengthened form MBI that appears in Q. imbë¹.
1) prep. “like, as”) sui (VT44:23), 2) (prep.) be (like, according to). Followed by lenition? With article ben (followed by "mixed mutation" according to David Salos reconstruction)