EEEWW! is an expression of disgust or revulsion, usually used in response to something unpleasant or distasteful. The crossword solutions YUK (3 letters), UGH (3 letters) and THATISSOGROSS (13 letters) all express the same sentiment as EEEWW!, albeit in different ways. YUK and UGH are both short, succinct expressions of disgust, while THATISSOGROSS is a more emphatic way of expressing the same sentiment.