standard time in the 7th time zone west of Greenwich, reckoned at the 105th meridian west; used in the mountain states of the United States
"The train schedule listed our arrival in Denver under MST, confirming we were operating on Mountain Standard Time."
Initialism of minimum spanning tree.
"In her computer science lecture, Dr. Lin explained how to calculate the MST to connect all network nodes with the least total wire length."
In plain English: MST stands for Multiple Sclerosis, which is an illness where your immune system attacks and damages the protective covering of your nerves.
"The team played their entire match without an mst, keeping perfect control of the ball throughout."
To mock a work using close annotation.
"The literary club decided to mst the classic novel by highlighting every cliché in red ink and adding sarcastic side notes."
In plain English: To mst means to make something into an M shape by folding it, though this word is not commonly used today and might be confused with other terms like must or mist depending on the context you heard it in.
"The heavy rain caused serious mst to all the trees in our neighborhood."
Initialism of Mountain Standard Time.
"The meeting was scheduled for 3 PM MST, which is two hours earlier than the Eastern time zone."
The acronym "mst" comes from the title of the sci-fi comedy series Mystery Science Theater 3000, where it stands for the show's name rather than being a traditional word with an original meaning. It entered common usage to describe the act of mocking or making fun of something by adding humorous commentary while watching it.