RichThesaurus
shoot one's mouth off
vs
talk the hind leg off a donkey
shoot one's mouth off
verb
To make reckless or exaggerated statements.
talk the hind leg off a donkey
verb
To talk a lot.
How often have the words
shoot one's mouth off
and
talk the hind leg off a donkey
occurred in a corpus of books?
(source:
Google Ngram Viewer
)