hot air
US /hɑt ɛr/
UK /hɑt ɛr/

1.
bla-bla, fanfaronnade
empty, exaggerated, or boastful talk
:
•
His promises were just a lot of hot air.
Ses promesses n'étaient que du bla-bla.
•
Don't listen to his hot air; he never follows through.
N'écoute pas son bla-bla; il ne tient jamais ses promesses.