know one's stuff

Verb

 * 1)  To be knowledgeable about and competent at a particular subject or task.

Antonyms

 * See

Translations

 * Danish: kende sin vej rundt
 * Polish: znać się na czymś
 * Turkish:


 * Danish: kunne sit kram, være velindsat
 * Finnish: osata hommansa
 * French:
 * German: sich gut auskennen, gut Bescheid wissen
 * Italian: sapere il fatto proprio