challenge on

challenge someone on something

to dispute someone's statement, remarks, or position. I think Fred is wrong, but I won't challenge him on his estimate.

Name	Pronounced	Usage
Josse	-	French (Rare), Medieval French
Scarlett	['ska:lət]
Orinthia	-	Literature
Muireall	-	Scottish
Nethaniah	neth-ə-NIE-ə (English)	Biblical
Ulrich	UWL-rikh (German)	German, French, Ancient Germanic