失效 shīxiào to fail
to fail; to lose effectiveness
How to remember 失效: 失 to lose + 效 result = to fail.
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How it is used
- To lose effect / expire / fail - 药物失效 (yàowù shīxiào) the medicine stops working; 合同失效 (hétong shīxiào) the contract lapses.
- About losing validity or effectiveness; contrast 生效 (shēngxiào, to take effect). Neutral/formal.