verb

• Senses relating to life or states of activity.
  "[…] Italy had quickened Cecil, not to tolerance, but to irritation. He saw that the local society was narrow, but, instead of saying, "Does this very much matter?" he rebelled, and tried to substitute for it the society he called broad."
• Senses relating to life or states of activity.
  "For ſurely, a rich Land, guardleſs and undefended, muſt needs have been a double Incitement, and ſuch an one, as might not only admit, but even invite the Enemy. It was like a fruitful Garden, or a fair Vineyard without an Hedge, that quickens the Appetite to enjoy ſo tempting, and withal ſo eaſy a Prize."
• Senses relating to life or states of activity.
• Senses relating to life or states of activity.
  "Whoſoever will goo about to ſave his lyfe⸝ shall looſe it: And whoſoever ſhall looſe his life⸝ ſhall quycken it."

verb

• (transitive, rare) To apply quicksilver (mercury) to (something); to combine (something) with quicksilver; to quicksilver.

noun

• (chiefly Ireland, Northern England) In full quicken tree: the European rowan, rowan, or mountain ash (Sorbus aucuparia).
  "[…] Miss Wannop moved off down the path: it was only suited for Indian file, and had on the left hand a ten-foot, untrimmed quicken hedge, the hawthorn blossoms just beginning to blacken at the edges and small green haws to show."

noun

• (chiefly Midlands (northern), Northern England, Northern Ireland, Scotland) Synonym of couch grass (“a species of grass, Elymus repens”); also (chiefly in the plural), the underground rhizomes of this, and sometimes other grasses.
  "Quickens-bog may at first seem to derive its name from the plant Quicken, by which, Scotticé, we understand couch-grass, dog-grass, or the Triticum repens of [Carl] Linnæus, and the common English monosyllable Bog, by which we mean, in popular language, a marsh or morass; in Latin, Palus."