ascending and descending, climbing and coming back down (particularly as of a person or thing travelling or moving up and down, such as stairs or levels)

to ascend and descend, to climb and come back down (particularly as of a person or thing travelling or moving up and down, such as stairs or levels)

to travel roundtrip on a river, going both upstream and downstream / to rise and fall, to ascend and descend / to exchange words, to discuss, to question and answer

climbing up and climbing down (particularly as of a person or path travelling or moving up and down, such as a road going uphill and downhill in the mountains)

the nobility and the commoners / volumes one and two of a two-volume book or other document / (clothing) a suit, a set of clothing consisting of garments for the upper and lower body

to climb up and climb down / to go upstream and downstream (such as on a river, or on a highway with “up” indicating towards a city)

to distinguish; to discriminate

discrimination

(literary) they (about women or girls)

low class, low grade, low degree