jiè​tí​fā​huī

expound

借题发挥 (借題發揮) jiè​tí​fā​huī
expound expression
to use a current topic as a starting point to express or elaborate on one's own ideas
seize pretext expression
to use an incident or topic as a pretext to make a fuss or vent one's feelings

Frequency

Movie subtitles
0.060 per million appears in 0% of films
Written text
0.454 per million

Sources

Definitions
CC-CEDICT