know chalk from cheese

To be able to tell two things apart (especially by recognizing their differences). Of course I know which twin is which, I know chalk from cheese, after all! Leah has a beauty mark under her left eye, and Deena doesn't.

Common Names:

Name	Pronounced	Usage
September	sep-TEM-bər	English (Rare)
Trajan	TRAY-jən (English)	History, Macedonian
Martinus	-	Ancient Roman, Dutch
Isaiah	ie-ZAY-ə (English), ie-ZIE-ə (English)	English, Jewish, Biblical
Delphine	['delfi:n]
KoppÁNy	-	Hungarian