jí​zhuǎn​zhí​xià

to take a sudden turn

急转直下 急轉直下 jí​zhuǎn​zhí​xià
to take a sudden turn
to develop rapidly after an abrupt change (of a situation, plot, etc.); to take a turn for better or worse, often leading to a precipitous decline or conclusion

Frequency

Movie subtitles
0.720 per million appears in 0% of films
Written text
0.712 per million

Sources