"to make utterly confused, put into muse or reverie, muddle, stupefy," from be- + muse (compare amuse); attested from 1735 but probably older, as Pope (1705) punned on it as "devoted utterly to the Muses."
beltway
beluga
belvedere
Bembo
bemoan
bemuse
bemused
bemusement
ben
bench
benchmark