poach: English has two words poach, both of which go back ultimately to Old French pocher ‘put in a bag’, a derivative of poche ‘bag’ (source of English pocket and pouch). The cookery term [15] is an allusion to the forming of little ‘bags’ or ‘pockets’ around the yolk of eggs by the coagulating white. Poach ‘steal’ [17] seems to mean etymologically ‘put in one’s pocket’. => pocket, pouch[poach etymology, poach origin, 英语词源]