失效

shīxiào

verb HSK 7-9 #6,853

Meanings

Literally 'lose effect' - something no longer works or is no longer valid.

HSK 4

药物放太久会失效。

Yàowù fàng tài jiǔ huì shīxiào.

Medicine will lose its effectiveness if stored too long.

HSK 6

这张优惠券已经失效了。

Zhè zhāng yōuhuìquàn yǐjīng shīxiào le.

This coupon has already expired.

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