noun

• (informal) Perquisite.
  "Free coffee is one of the perks of the job."
• (video games) A bonus ability that a player character can acquire; a permanent power-up.

verb

• (transitive, informal) To make (coffee) in a percolator or a drip coffeemaker.
  "I’ll perk some coffee."
• (intransitive, informal) Of coffee: to be produced by heated water seeping (“percolating”) through coffee grounds.
  "The coffee is perking."

verb

• (transitive) To make trim or smart; to straighten up; to erect; to make a jaunty or saucy display of.
  "[the squirrel] whisks his brush And perks his ears, and stamps and scolds aloud"
• (intransitive) To appear from below or behind something, emerge, pop up, poke out.
  "The heads of plants above the crack’d ground perk:"
• (intransitive, obsolete) To exalt oneself; to bear oneself loftily.
  "1574, Arthur Golding (translator), Sermons of Master John Calvin, upon the Booke of Job, London: Lucas Harison and George Byshop, Sermon 38, The first upon the tenth Chapter, For whereof commeth thys hypocrisie in the popedome, that men shall preache free will, merits, and satisfactions, and set vp their bristles in suche wise, and beare themselues in hande that they may come perking before God, yea and preace thither lyke shamelesse strumpets."

adj

• (obsolete) Smart; trim; spruce; jaunty; vain.
  "My ragged rontes all shiver and shake, As doen high Towers in an earthquake: They wont in the wind wagge their wrigle tailes, Perke as Peacock: but nowe it auales."