Fingerprint, say is a term used to describe the unique pattern of ridges and valleys on the surface of a finger. This pattern is used for identification purposes and is often referred to as a 'SMUDGE'. The CLUE for this term is four letters long and the solution is 'DAB'. The SMUDGE is six letters long and the solution is 'SMUDGE'. Fingerprint, say is a term used to describe the process of using fingerprints to identify individuals.