Karuta a

a
あ, hiragana
ア, katakana

あつものに懲りてなますを吹く

He blows on cold dishes to cool them because he has burned his tongue with a hot soup before.

[Meaning]
Being careful too much because he made mistakes before.

[Example]
You slipped once, but don't be too careful because your time will be later. Don't 'Atsumono ni korite namasu wo fuku'.

[Words]

あつもの  hot  clear Japanese soup

懲りる (こりる)  learn one's lesson

なます  finely chopped raw fish [vegetables] soaked in (seasoned) vinegar

吹く (ふく)  blow