fú​chén

to float and sink

浮沉 fú​chén
to float and sink
to alternately float and sink; to drift in and out of view in water
to drift along
to follow the current or go along with the crowd; to drift along with the times
to be lost
to describe letters or messages that are lost in transit or fail to reach their destination
vicissitudes
the ups and downs of life or a career; the rise and fall of fortunes

Frequency

Movie subtitles
0.090 per million appears in 0% of films
Written text
0.958 per million

Sources