To fall outside of, or part from, some norm; to stray.
To go off course from; to change course; to change plans.
To cause to diverge.
A person with deviant behaviour; a deviant, degenerate or pervert.
A value equal to the difference between a measured variable factor and a fixed or algorithmic reference value.
To become lost or mislaid.
To be undesirable or unhelpful.
To come to believe an untruth.
To behave in an adulterous manner.
Used other than figuratively or idiomatically: see go, astray.
To develop bad habits; to behave improperly or illegally.