a visual presentation showing how something works
"the lecture was accompanied by dramatic demonstrations"
"the lecturer shot off a pistol as a demonstration of the startle response"
A demonstration or visual explanation.
"The tech support agent asked me to watch a live demo of the new software features before we proceeded with the purchase."
In plain English: A demo is a short version of something, like a song or software, made to show people what it's like before they buy the full thing.
"The tech company invited journalists to see the new smartphone demo."
Usage: As a noun, a demo refers to a short sample or preview of a product, software, or performance designed to showcase its features before purchase. It is also commonly used to describe a live musical rehearsal where the band plays through their set without an audience.
give an exhibition of to an interested audience
"She shows her dogs frequently"
"We will demo the new software in Washington"
To record a demo version of a song, usually not intended for commercial release.
"The construction crew received the green light to demo the old warehouse before starting work on the new shopping center."
To demolish (especially a house or fixture).
In plain English: To demo something means to test it out by using it for a short time before you decide if you want to keep it.
"The tech company will demo the new smartphone at the upcoming trade show."
Usage: Use "demo" as a verb to mean quickly dismantling or taking apart something, such as removing a wall or fixtures before renovation. It implies doing the work rapidly and often without full professional cleanup.
The word demo is a clipping derived from the longer term demonstration. It entered common usage as a shortened form to refer specifically to a public display or preview of something new.