Definition
To have an excessively high opinion of oneself, often regarding one's attractiveness or importance.
自命不凡；自以为是
The young actor always fancies himself, thinking he's a big star.
这位年轻演员总是很自命不凡，认为自己是明星。
She always dresses impeccably because she fancies herself as very attractive.
她总是穿得很得体，因为她自认为非常有魅力。
He often talks at length in meetings, clearly fancying himself as an expert.
他经常在会议上长篇大论，显然自认为是专家。