Bush"whack`er (?), n.
1.
One accustomed to beat about, or travel through, bushes.
[U.S.]
They were gallant bushwhackers, and hunters of raccoons by moonlight.
W. Irving.
2.
A guerrilla; a marauding assassin; one who pretends to be a peaceful citizen, but secretly harasses a hostile force or its sympathizers.
[U.S.]
Farrow.
© Webster 1913.