known quantity

someone whose character, personality, and behavior are recognized and understood. We need not worry about how John will behave. He is a known quantity. Lisa is a known quantity and I am sure she will not surprise us by voting with the opposition.

Common Names:

Name	Pronounced	Usage
Tuttle	['tʌtl]
Beverly	['bevəli]
Fiorenza	fyo-REN-tsah	Italian
Apollinaris	-	Ancient Greek
Yocheved	-	Hebrew, Biblical Hebrew
Mahmoud	-	Arabic, Persian