the apple of someone's eye
US /ðə ˈæpəl əv ˈsʌm.wʌnz aɪ/
UK /ðə ˈæpəl əv ˈsʌm.wʌnz aɪ/
1.
a person or thing that someone loves most and is very proud of
:
•
His youngest daughter is the apple of his eye.
•
That old car is the apple of his eye; he spends hours polishing it.