Oxford Dictionary English shirt tail nounnoun BrE BrE//ˈʃɜːt teɪl// ; NAmE NAmE//ˈʃɜːrt teɪl// Add to my wordlistjump to other resultsthe part of a shirt that is below the waist and is usually inside your trousers/pants He ran out of the house, his tie in his hand and his shirt tail hanging out.Check pronunciation: shirt tail oxfordlearnersdictionaries.com