Meaning of the word "a notch above" in English

What does "a notch above" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

a notch above

US /ə nɑtʃ əˈbʌv/
UK /ə nɒtʃ əˈbʌv/

Phrase

slightly better than something else

Example:
This new model is definitely a notch above its predecessor.
Her performance was a notch above the rest of the competitors.