What does the word launch mean?

Usage examples for launch

  1. Now he must launch out again and paddle, perhaps all night, in search of his missing chief. – For the Allinson Honor by Harold Bindloss
  2. That's how I happen to know something about an engine; and I have been on board of all sorts of steamers with Paul, for the purpose of studying the engines, from a launch up to the biggest ocean- steamers. – Taken by the Enemy by Oliver Optic
  3. Everything was put into the boat, and all through the night they stood watch, half- and- half, ready to launch her at a moment's notice. – True Tales of Arctic Heroism in the New World by Adolphus W. Greely