something that you say to tell someone that you will help them if they will help you.

I do have some information you might be interested in, but what can you offer me in return? You scratch my back and I'll scratch yours.

• Empty vessels make most sound.
• Empty vessels make the most noise.
• Empty vessels make the most sound.
• end it all
• end justifies the means.
• end of story
• End of story.
• end of the line
• end of the road
• endowed with
• endowed with something
• end up
• Enough is as good as a feast.
• enough is enough
• Enough said.
• nickel and dime
• nickel-and-dime
• nickel and dime someone
• night after night
• night and day
• nightmare scenario
• night on the razzle
• night on the tiles
• night on the town
• night out on the razzle