noun 1.the part of a
shirt below the waistline.
2.Journalism. a brief item added at the end of a related newspaper story. Compare
follow-up ( def 3b ).
adjective 3.quite young and immature in behavior.
4.Chiefly Midland and Southern U.S. of distant relation, especially by
marriage:
some shirttail cousins I'd never met.
verb (used with object) 5.Informal. to append or add (an item) to a discussion or writing: The tariff concessions were shirttailed onto the trade bill.