thank-you
nounUK /ˈθæŋk.juː/
US /ˈθæŋk.juː/
Something you say or give to show you are happy about what someone did.
She sent a thank-you card to her teacher.
OTHER MEANINGS
2. Words you say to show you are grateful.
He said a quick thank-you before leaving.
3. A small gift given to show thanks.
They brought flowers as a thank-you for the dinner.
4. A message or note that expresses thanks.
I wrote a thank-you to my neighbor for feeding my cat.