noun

• (historical) An area of common land for use by domestic animals.
• (British, law, archaic) An article of movable property, of which the owner is not known (see waif).
  "waifs and strays"
• (radio) An instance of atmospheric interference.
  "This invention relates broadly to radio communication, but more particularly to a radio receiving system used for the reception of high frequency current signals wherever they are subject to interference from "static" or strays of an untuned or aperiodic character."
• (slang) A casual or offhand insult.

verb

• (intransitive) To wander, as from a direct course; to deviate, or go out of the way.
  "Thames among the wanton valleys strays."
• (intransitive) To wander from company or outside proper limits; to rove or roam at large; to go astray.
• (intransitive) To wander from the path of duty or rectitude; to err.
  "November 2 2014, Daniel Taylor, "Sergio Agüero strike wins derby for Manchester City against 10-man United," guardian.co.uk It was a derby that left Manchester United a long way back in Manchester City’s wing-mirrors and, in the worst moments, straying dangerously close to being their own worst enemy."
• (transitive) To cause to stray; lead astray.
  "Hath not else his eye / Strayed his affection in unlawful love,"