It refers to the telephone workload consisting of periods of near-non-stop telephone calls for non-receptionist personnel. Individuals are responsible for call details and information forwarding, filing, and follow-up.
how heavy it is most common
"Heavy" is a term used for any aircraft with a certified maximum takeoff weight of over 255000 pounds.
Pesante is Italian for heavy.
The term buy phone would seem to suggest that someone is intending to purchase a phone. It does not appear to have any particularly special or different meanings attached to it as a phrase.
Tony Puma. "Experience Makes The Difference".
I think that a horrow A farm implement consisting of a heavy frame with sharp teeth or upright disks, used to break up and even off plowed ground.
Usually, "lots of people died", e.g. a heavy price in blood. It can also mean "lots of property (things, weapons, materials, buildings, bridges) was destroyed".
A banana dance is a term (slang) meaning crazy dance while a banana phone is a phone shaped like a banana or a slang to mean a crazy phone (with sexual connotations)
Phuket is the Thai word for Thai, and holidays in this sense means "to experience," so the term "phuket holidays" means "to experience Thailand."
"Largo" is a slow, plodding, heavy tempo - like the marching of elephants.
"Gravis" is a Latin word meaning heavy. It can also mean weighty, serious, burdensome, important, severe, grievous, and unwholesome. It can also be written as grauis.
The weather term for how "heavy" the air is is humidity. Humidity measures the amount of water vapor in the air, affecting how heavy or oppressive the atmosphere feels.