qián​yè

eve

前夜 qián​yè
eve time word
the period of time or lead-up immediately preceding a significant event or change

The country was then on the eve of a great social transformation.

night before time word
the night or evening immediately preceding a particular day or event

He was so nervous on the eve of his wedding that he didn't sleep all night.

Frequency

Movie subtitles
3.04 per million appears in 1% of films
Written text
2.82 per million

Sources

Definitions
CC-CEDICT