- quite young and immature in behavior.
- Chiefly Midland and Southern U.S. of distant relation, especially by marriage: some shirttail cousins I'd never met.
- Informal. to append or add (an item) to a discussion or writing: The tariff concessions were shirttailed onto the trade bill.
Origin of shirttail
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018