1. practical knowledge, ability, or skill to do something
have the know-how to do something
This expression refers to methods or techniques of how to do something in an efficient way, especially something technical or practical that requires aptitude or skill. 'Know-how' is usually something learned, or acquired through experience. It is most commonly used in a professional context but applies to certain social situations too, such as in relation to fixing something. Phrases with a similar meaning include 'the knack of,' and 'business savvy.'