Broken in is a commonly used phrase which is typically employed to describe something that has been well-worn or accustomed to use. However, the term 'broken in' has several synonyms such as seasoned, acclimatized, habituated, familiar, experienced, practiced, trained, adjusted, acclimated, etc. Each of these words can be used in place of 'broken in' to convey the same meaning, depending on the context. Synonyms for 'broken in' are often used in discussions about clothing, shoes, and equipment in sports. Knowing and using synonyms for the word 'broken in' provides you with a broader vocabulary range and makes your communication more diverse.