páng​tīng

audit

旁听 (旁聽) páng​tīng
audit verb
to attend a class or lecture without being enrolled for academic credit

I want to audit a few of Professor Wang's literature classes.

observe verb
to be present at a meeting, trial, or official proceedings as an observer

Many citizens applied to observe this public hearing.

Frequency

Movie subtitles
1.76 per million appears in 1% of films
Written text
3.70 per million

Sources

Definitions
CC-CEDICT