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

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)

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)

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)

space; interval; among; between / extent; scope / hidden; invisible / Alternative spelling of 閑 (kan, “free time”)

suffixes some expressions of time to tell duration rather than time or date

between / intervening space / interval / gap / pause

one's presence as felt by others

bourgeoisie (middle class)