The Collaborative International Dictionary of English v.0.48:
Impose \Im*pose"\, v. i.
To practice tricks or deception.
To impose on or To impose upon,
(a) to pass or put a trick on; to delude; to cheat; to
defraud. "He imposes on himself, and mistakes words for
(b) to place an unwelcome burden or obligation on (another
person); as, she imposed on her friend to drive her
daughter to school.
(c) to take unfair advantage of (a person, a friendship); as,
he imposed on his friendship with The Mayor to gain
[1913 Webster +PJC]