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up and down
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Quick answer
As an adverb, up and down means moving backward and forward along a given course.
Meanings of up and down
2 meaningsadverb
Moving backward and forward along a given course
“he walked up and down the locker room”
“all up and down the Eastern seaboard”
Alternately upward and downward
“he eyed him up and down”
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).