cos

conjunction (informal spoken form of "because"); also abbreviation cos (maths: cosine)

«cos» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

Everyday

(slang, informal, UK and elsewhere) A short spoken form of "because", also written 'cause or coz. tree →
(maths) Short for "cosine", a function used with angles in triangles (older pupils). tree →

In the lessons

Children hear "cos" in casual talk all the time: "I'm late cos the bus broke down". In real-speech lessons it signals a reason, just like "because". In secondary maths, cos is written next to an angle: cos 60°. Not used in formal writing.

Examples

I didn't go out cos it was raining. tree →
"Why are you laughing?" "Cos your face is funny!" tree →
We stayed in cos Mum said so. tree →
He's tired cos he stayed up late. tree →
I like her cos she's kind. tree →
On a calculator, press cos to find the cosine of an angle. tree →

Note

"Cos" is not a proper word for school writing; write "because". Pronounced "koz" when it means because. The maths "cos" is short for cosine and is said "koz" too. In a word problem "cos" introduces a reason; it does not change the numbers.

On Mova

Trees and pragmatics of «cos» in the school dictionary: every meaning and example parsed by Mova, with its dependency tree and frames.
«cos» in the school dictionary on Mova free.

This page in Markdown → https://md.dictionary.elamur.ai/free/en/english/cos/