Meaning of the word "to one's surprise" in English

What does "to one's surprise" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

to one's surprise

US /tə wʌnz sərˈpraɪz/
UK /tə wʌnz səˈpraɪz/

Phrase

used to say that something was unexpected or surprising to someone

Example:
Much to one's surprise, the quiet student won the debate competition.
To my surprise, the package arrived a day early.