Deviate (?), v. i. [imp. & p. p. Deviated (?); p. pr. & vb. n. Deviating (?).] [L. deviare to deviate; de + viare to go, travel, via way. See Viaduct.] To go out of the way; to turn aside from a course or a method; to stray or go astray; to err; to digress; to diverge; to vary.
[1913 Webster]

Thus Pegasus, a nearer way to take,
May boldly deviate from the common track. Pope.

Syn. -- To swerve; stray; wander; digress; depart; deflect; err.
[1913 Webster]

deviate (dēv&euptack_;&ibreve_;t), a. having behavior differing from that which is normal or expected, especially in an undesirable or socially disapproved manner; as, deviate behavior.
Syn. -- deviant. [PJC]