The act of pouring.
"She carefully poured the milk into her coffee cup."
In plain English: A pour is an accidental spill of liquid that makes a mess on the floor or table.
"The rain poured all night long."
Usage: As a noun, "pour" refers to a continuous and heavy fall of rain or snow, such as during a thunderstorm. It describes the intensity and duration of the precipitation rather than the specific action of liquid flowing from a container.
rain heavily
"Put on your rain coat-- it's pouring outside!"
To cause (liquid, or liquid-like substance) to flow in a stream, either out of a container or into it.
"The teacher corrected my essay by circling the word pour, noting that it was a misspelling of pore."
Misspelling of pore.
In plain English: To pour means to let liquid flow out of a container so it spills into another place.
"She poured a glass of water for her friend."
Usage: Pour means to cause a liquid or fine granular substance to flow freely from a container. It is not a misspelling of pore, which refers to a tiny opening in the skin or a fabric material.
The word "pour" comes from Middle English pouren, which likely entered the language from Old Northern French purer, meaning to sift grain or pour out water. This French term ultimately traces back to the Latin pūrō, derived from pūrus, meaning "pure."