make someone's day
US /meɪk ˈsʌm.wʌnz deɪ/
UK /meɪk ˈsʌm.wʌnz deɪ/

1.
to do something that makes someone feel very happy
:
•
Receiving that unexpected compliment really made my day.
•
Your visit would truly make her day.
to do something that makes someone feel very happy