dispatch rider 
noun British
A messenger who delivers urgent business documents or military dispatches by motorcycle or (formerly) on horseback.Titchmarsh carried out his duties as a dispatch rider first on horseback and then on a motorcycle....
- Anybody who wants to be a cycle despatch rider will tend to be a little alternative in their thinking, Mick admits - so it seemed natural to turn to a complementary health centre to keep them in shape.
- A dispatch rider at the start of the First World War, Portal was soon commissioned and then seconded to the Royal Flying Corps in which he served with distinction.
- you are welcome
- you bet
- you betcha
- you (can) bet your boots
- you (can) bet your bottom dollar
- you (can) catch more flies with honey than (with) vinegar
- you can lead (or take) a horse to water but you can't make him drink
- you can say that again!
- you can't get a quart into a pint pot
- you can't have your cake and eat it (too)
- you can't judge a book by its cover
- you can't keep a good man (or woman) down
- you can't lose
- you can't make a silk purse out of a sow's ear
- you can't make bricks without straw
- you can't (or can) talk (you shouldn't or should talk)
- you can't put an old head on young shoulders
- you can't teach an old dog new tricks
- you can't win them all (or win some, lose some)
- you could have fooled me!
- you could have knocked me (or her, him, etc.) down with a feather
- you couldn't make it up
- you'd
- you don't say (or you don't say so)!
- Youghiogheny River