Definitions
There are 2 meanings of the phrase
Up And Down.
Up And Down - as an adverb
Moving backward and forward along a given course
Example: "He walked up and down the locker room"
Alternately upward and downward
Example: "He eyed him up and down"
Example Sentences
"He looked up and down the street searching for his lost keys."
"The elevator went up and down several times before reaching the desired floor."
"The roller coaster quickly went up and down the tracks."
"She paced up and down the room, unable to sit still."
"The child jumped up and down with excitement on Christmas morning."