过硬 guòyìng to have perfect mastery of something
to have perfect mastery of something; to be up to the mark
How to remember 过硬: 过 to cross + 硬 firm = to have perfect mastery of something.
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How it is used
- To be first-rate / thoroughly reliable - passing every test - 技术过硬 (jìshù guòyìng) rock-solid skills; 质量过硬 top-notch quality.
- Praises competence, quality, or character that holds up under pressure (作风过硬 an impeccable work style; 本领过硬).
- Idiomatic "hard enough to withstand scrutiny"; stronger and more battle-tested than 很好 - it implies proven, dependable excellence.