LUG n.
A projecting piece to which anything, as a rod, is attached, or against which anything, as a wedge or key, bears, or through which a bolt passes, etc.
MAIL n.
boat, a boat that carries the mail. -- Mail catcher, an iron rod, or other contrivance, attached to a railroad car for catching a mail bag while the train is in motion. -- Mail guard, an officer whose duty it is to guard the public mails. [Eng.] -- Mail train, a railroad train carrying the mail.