Wiktionary
vb. (present participle of let off English)
Usage examples of "letting off".
She sat in beside me and I did all the automatic things like switching on the lights and letting off the handbrake, and I drove all the way to Clapham without consciously seeing the road.
Through the hanging smoke, Lefty saw other streetcars letting off other workers, hundreds and hundreds of gray figures trudging across the paved courtyard toward the factory gates.
Spirit was reminded of her dialogue with Helse, about letting off sexual valve pressure, and almost laughed.
Are you telling me things I don't know, or is this just in the nature of letting off steam--do forgive the mixed metaphor--on my shoulder?
The room was scarcely less quiet than the street outside, for many of the patients were making very peculiar noises: a sweaty-faced witch in the centre of the front row, who was fanning herself vigorously with a copy of the Daily Prophet, kept letting off a high-pitched whistle as steam came pouring out of her mouth.
The chestnuts are in bloom, the cobblestones shine, the carriages are letting off stick figures in the distance.