tongue-tie

Ankyloglossia, a congenital oral anomaly.

A piece of cloth used to tie down a horse's tongue, to facilitate breathing etc.

To disconcert or fluster (a person) so that they cannot speak coherently.

Marry—as the friendly vapour ascended, how his prattle would curl up sometimes with it! the ligaments, which tongue-tied him, were loosened, and the stammerer proceeded a statist!