Phrasal Verbs with LET

let down
to make someone disappointed
I promised Tim that I’d help him, and I won’t let him down.

let up
to stop or become less strong
We can go when the rain lets up.

let off
to give someone a lighter punishment or no punishment at all
The police officer let him off with just a warning.

let on
to tell, admit, or show that you know something
He knows a lot more than he lets on.

let out
to make a particular sound
He let out a sigh of relief.