hold forth
US /hoʊld fɔːrθ/
UK /hoʊld fɔːrθ/

1.
disquisire, dilungarsi
to speak at length about a subject, often in a rather boring or pompous way
:
•
He loves to hold forth on politics whenever he gets the chance.
Gli piace disquisire di politica ogni volta che ne ha l'occasione.
•
The professor would often hold forth on his latest research findings.
Il professore spesso si dilungava sui suoi ultimi risultati di ricerca.