Meaning of the word "a bitter pill to swallow" in English

What does "a bitter pill to swallow" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

a bitter pill to swallow

US /ə ˈbɪtər pɪl tuː ˈswɑːloʊ/
UK /ə ˈbɪtə pɪl tuː ˈswɒləʊ/

Idiom

an unpleasant or difficult fact, situation, or piece of information that is hard to accept

Example:
Losing the championship was a bitter pill to swallow for the team.
Having to apologize, even though he felt he was right, was a bitter pill to swallow.