unwritten law

An accepted although informal rule of behavior, as in It's an unwritten law that you lock the gate when you leave the swimming pool. [Mid-1400s]

Name	Pronounced	Usage
Debbi	DEB-ee	English
Janus	-	Roman Mythology
Adella	ə-DEL-ə	English
Esthiru	-	Old Church Slavic
Tabea	tah-BE-ah	German
StaŠA	-	Serbian, Slovene, Croatian