along
preposition /əˈlɒŋ/
  /əˈlɔːŋ/
- from one end to or towards the other end of something
- They walked slowly along the road.
 - I looked along the shelves for the book I needed.
 
 - in a line that follows the side of something long
- Houses had been built along both sides of the river.
 
 - at a particular point on or next to something long
- You'll find his office just along the corridor.
 
 
Word OriginOld English andlang, of West Germanic origin; related to the adjective long.