be a (something) to (one's) fingertips

To be a particular thing to the utmost degree. Oh, I'm a student to my fingertips—that's why I'm now pursuing a doctorate.

Name	Pronounced	Usage
Joon-Ho	joon-ho	Korean
Arness	['a:nəs]
Ruchel	-	Yiddish
Beverly	BEV-ər-lee	English
Orville	['ɔ:vil]
Claudia	KLAW-dee-ə (English), KLOW-dee-ah (German, Dutch), KLOW-dyah (Italian, Spanish, Romanian)	English, German, Dutch, Italian, Spanish, Romanian, Biblical, Ancient Roman