What does up and down mean?

phr. moving in a direction that rises and then falls; moving from one end to the other and back

up and down

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Tags CEFR-B2

phrase

moving in a direction that rises and then falls

The kids were jumping up and down with excitement.

moving from one end to the other and back

He was pacing up and down the hallway, waiting for the news.

moving in a direction that rises and then falls; moving from one end to the other and back