Let (something) go

To allow something to pass, to do nothing about something.Although I was angry at my friend's remark I decided to let it go.

Let (something) go

To pay no attention to something, to neglect something.The girl is letting her appearance go since she lost her job.

Let (someone) walk away with (something)

To let someone have something.The store let me walk away with the new computer for a very cheap price.

Let (someone) off the hook

To excuse someone from a penalty or a promise.My boss let me off the hook and I did not have to stay after work and help clean the office.

Let (someone) off (easy)

To release someone with little or no punishment.The judge let the man off easy because the man was sincere in his apology for his crime.

Let (someone) off

To permit someone to leave a car or train or boat or plane or other transportation.The train stopped at a small town and let the young woman off.

Let (someone) know (about something)

To tell or inform someone about something."Let me know when you are ready to go to the movie."

Let (someone) in on (something)

To tell someone a secret.We let our friend in on our plan to sell our apartment and buy a house.

Let (someone) have it with both barrels

To attack someone verbally.The woman let her husband have it with both barrels when he came home late from work without phoning.

Let (someone) have it

To hit someone hard, to scold someone angrily.One man let another man have it when they had a fight on the bus.