FOS

American

Or F.O.S.

abbreviation

free on station.
free on steamer.
Slang. full of shit (a euphemistic initialism used to avoid explicit vulgarity). See shit.

FOS British

abbreviation

fructooligosaccharide: a chain polymer of fructose found in a variety of plants, vegetables, and fruits and used as a sweetener

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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FOS

Before Monday night’s Buffalo Bills-Rams game at SoFi Stadium, FOS reports, Buck brought up the matter to his broadcast partner, and an argument ensued.

From Los Angeles Times ● Oct. 15, 2026

First staged in 1993, the FOS has become a must-go for both motorheads and, lately, manufacturers.

From The Wall Street Journal ● Jul. 18, 2026

The team also traced the gene FOS, which is widely expressed in blood cells across many animal species, back to a unicellular ancestor that lived about 700 million years ago.

From Science Daily ● May 27, 2026

Bloomberg News reported the deal valued FOS at about $40 million.

From Reuters ● Oct. 2, 2023

The FOS said that many of those affected are already struggling financially.

From BBC ● Aug. 18, 2014

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023