The crossword solution for the term 'FLAP, SO TO SPEAK' is ADO. This is an acronym for 'A Dose Of', which is a phrase used to describe a small amount of something. It is often used in the context of taking medicine, where a doctor might prescribe a patient 'a dose of antibiotics'. It can also be used more generally to describe a small amount of anything, such as 'a dose of courage' or 'a dose of luck'.