This use shows the action of giving food in the past. 'Fed' is the simple past form and also the past participle of 'feed'. It is used when talking about feeding someone or some animals.
I fed the dog this morning.
She fed the baby some milk.
'Fed' here is short for 'federal agent' or police officer. It is often used in informal or slang contexts to refer to police or law enforcement agents, especially in the US or other English-speaking countries.
The feds came to ask questions.
Watch out for the feds nearby.
In finance, 'the Fed' is a common short name for the Federal Reserve Bank, which controls money supply and interest rates in the U.S. It is often mentioned in news about the economy.
The Fed raised interest rates today.
Economists watch the Fed closely.
In informal speech, 'fed' can mean a secret agent or informer working with government agencies. This usage is common in crime or spy stories.
They said he was a fed in the group.
The fed gave information to the police.
Besides food, 'fed' can mean to give other things like information or materials. For example, feeding data into a machine means inputting data for use.
He fed data into the computer.
She fed him lines for the play.
'Fed' can describe a person who has already eaten enough food and does not want more. It shows a feeling of being full or satisfied after eating.
I am fed after dinner.
She feels fed and happy now.
In US slang, 'the fed' sometimes means a federal prison or a person who is prisoner there. It is informal and mostly used in crime-related contexts.
He was sent to the fed for five years.
The fed is very strict and harsh.
