Curiosity filled his mind.
Meaning: This means a desire to know or learn something made his mind full.
Choice of Words: Curiosity is a desire to know or learn something. Filled means to make something full. Mind is the part of a person that thinks, feels, and remembers. When you put them together, "Curiosity filled his mind" means that a desire to know or learn something made his mind full.
Alternative Expressions
Related Expressions