Definition of reak in English:

reak

Pronunciation /riːk/

noun

(also reek)
historical Scottish
  • A prank; a playful or capricious trick, a riotous practice. Chiefly in plural.

    Usually in "to keep (also play) reaks".

Origin

Late 16th century; earliest use found in George Gascoigne (d. 1577), author and soldier. Origin uncertain, as is the earliest form of the word. Apparently related to rex see discussion at that entry. Perhaps compare also freak.