The answer to the crossword for the term 'OPPOSITE OF SUCK' is 'BLOW' (4 letters). The term 'BLOW' is a verb meaning to move air out of the mouth, often used in the phrase 'to BLOW a kiss'. It can also mean to produce a sound by exhaling, such as blowing a whistle. In this context, it is being used as an opposite of the verb 'SUCK', which means to draw something in with force, usually with the mouth. Therefore, the opposite of 'SUCK' is 'BLOW'.