shī​xiào HSK7

lose effectiveness

失效 shī​xiào
lose effectiveness verb
to become invalid or no longer operative, as with laws, contracts, or medicine

Because it is past its expiration date, this medicine is no longer effective.

fail verb
to cease to function or break down, specifically regarding mechanical or technical systems

The aircraft's hydraulic system suddenly failed, resulting in an emergency landing.

Frequency

Movie subtitles
6.92 per million appears in 3% of films
Written text
4.76 per million

Details

HSK 3.0
Level 7

Sources

Definitions
CC-CEDICT