If one person or thing is with another, they are together in one place.
I stayed with her until she fell asleep.
The dictionaries go on that shelf with the other reference books.
If you do something with a tool or object, you do it using that tool or object.
Clean the floor with a mop.
He pushed back his hair with his hand.
used to mention an opponent
You use with after verbs like fight or argue. For example, if two people are fighting, you can say that one person is fighting with the other.
He was always fighting with his brother.
Judy was arguing with Brian.
Similarly, you can use with after nouns like fight or argument.
I had a disagreement with my friend.
She won a legal battle with her employer.
used in descriptions
You can use with immediately after a noun phrase to mention a physical feature that someone or something has.
He was an old man with a beard.
They lived in a house with white walls and a red roof.
You can use with like this to identify someone or something. For example, you can refer to someone as ‘the tall man with red hair’.
Who's that girl with the gold earrings?
Our house is the one with the blue shutters.
You don't usually use ‘with’ to mention what someone is wearing. Instead you use in.
I noticed a smart woman in a green dress.
The office was full of men in suits.
➜ See wear