This is the 3673rd most frequent Chinese word.
老子
"老子" means "Laozi," an ancient Chinese philosopher and the founder of Taoism.
In this sentence, '老子' refers to the renowned Chinese philosopher, Laozi.
老子认为世界是由道构成的。
Laozi believed the world is composed of the Dao.
Here, '老子' is used colloquially as a pronoun meaning 'I', often expressing self-assertion or defiance.
老子不想去参加那个聚会。
I don't want to attend that party.
In this context, '老子' again refers to the philosopher and serves as a proper noun in academic discussion.