The term 'sponge TARGET' is a combination of two crossword solutions, 'CRUMB' and 'TARGET'. CRUMB is a five-letter word meaning a small piece of food that has been broken off from a larger piece. TARGET is a six-letter word meaning an object, person, or place that is selected as the aim of an attack, plan, or action. Together, the two words form the phrase 'sponge TARGET', which can be used to describe a person or thing that is easily influenced or manipulated.