Backshish, Backsheesh n. In Egypt and the Turkish empire, a relatively small amount of money given for services rendered (as by a waiter); a gratuity; a "tip".
... half of it on to try and frighten you if you're a new hand," replied Jerrold as he jauntily walked into the cuddy with the air of a commodore. "Only give him a little backsheesh and ... — Afloat at Last - A Sailor Boy's Log of his Life at Sea • John Conroy Hutcheson