and FIDDLE (4 letters) The term 'illegally fix' can be broken down into two words, 'RIG' and 'FIDDLE'. RIG is a three letter word meaning to manipulate or adjust something dishonestly in order to gain an advantage. FIDDLE is a four letter word meaning to tamper with something in order to gain an advantage, usually illegally. Together, the two words form the phrase 'illegally fix', which means to manipulate or adjust something dishonestly in order to gain an advantage, usually in a way that is illegal.