The term 'sponge off' is a slang phrase that means to take advantage of someone else's generosity without offering anything in return. The crossword solutions for this term are MOOCH (5 letters), WIPE (4 letters), and FREELOAD (8 letters). MOOCH is another slang term meaning to ask for something without offering anything in return, while WIPE is an informal verb meaning to take something away from someone. FREELOAD is a verb meaning to take advantage of someone else's hospitality without offering anything in return. All three words are related to the phrase 'sponge off' and can be used to describe someone who takes advantage of another person's generosity without offering anything in return.