flattercapObs.exc.dial.|ˈflætəkæp| [f. as prec. + cap n.1] A flatterer. 1681W. Robertson Phraseol. Gen. (1691) 613 Avaunt all flattercaps.1855Robinson Whitby Gloss., Flatch or Flattercap, a flatterer; a term applied to wheedling children, when they try by flattery to gain their own little ends.