To obtain passage (on a ship or similar vehicle) by secreting oneself inside before departure.(verb)
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Use "stow away" in a sentence
"Where, in Heaven's name, will you stow away a painter and an assistant in the midst of half a brigade of dress-makers, seamstresses, lace-makers, and milliners, without counting the accompanying train of friends?"
"Packing up his gear ready to stow away in his cubicle alongside his own spacesuit he hadn't used, he was aware of Captain Mainwaring talking on the phone."
"One of the girls bounced into the chaise; and by the aid of the rest of the company, she was soon enabled to stow away in the box a goodly portion of all the varieties of nick-knacks just mentioned."