失效

shīxiào

verb HSK 7-9 #6,853

Meanings

Literally 'lose effect' — something no longer works or is no longer valid.

这张优惠券已经失效了。

Zhè zhāng yōuhuìquàn yǐjīng shīxiào le.

This coupon has already expired.

药物放太久会失效。

Yàowù fàng tài jiǔ huì shīxiào.

Medicine will lose its effectiveness if stored too long.

usage

失效 applies to anything that stops working or becomes invalid: medicine, contracts, coupons, passwords, laws. The opposite is 生效 (to take effect).

失 shī

效 xiào