dial. [Connected with FLAN a. Cf. FLANCH, FLANGE vbs.] intr. a. Of a vessel, etc.: To expand towards the top, to widen upwards. Also, To flan out. b. Of a window-jamb: To splay or bevel internally. Cf. FLANNING.
1788. W. Marshall, E. Yorksh., Gloss., To Flan; to spread wide; as the sides of a bowl or scuttle.
1876. C. C. Robinson, Mid-Yorksh. Gloss., s.v., ‘How she does flan with that gown of hers!’… A flower-vase ‘flans out’ at the top.
