1 to exchange

2 exchange

3 communication

4 interaction

5 to have social contact (with sb)

1 to flow

2 to disseminate

3 to circulate or spread

4 to move or drift

5 to degenerate

6 to banish or send into exile

7 stream of water or sth resembling one

8 class, rate or grade

1 meteor

2 shooting star

1 meteor shower

1 rogue

2 hoodlum

3 gangster

4 immoral behavior

1 (one's) every word and deed (idiom)

1 every word and action (idiom)

1 to not say a word (idiom)

1 one word worth nine sacred tripods (idiom); words of enormous weight

1 one word says it all (idiom, from Analects); to cut a long story short

2 in a nutshell