be cocksure of (oneself)

To be completely certain of oneself or one's actions, to the point of overconfidence. You seem pretty cocksure of yourself—do you really know how to handle that machine?

Common Names:

Name	Pronounced	Usage
Dulcie	DUL-see	English
Ermenegildo	-	Italian
Madlyn	MAD-lin	English
Pedro	PE-dro (Spanish)	Spanish, Portuguese
&Aelig;Thelweard	-	Anglo-Saxon
Trudie	TROO-dee (English), TRUY-dee (Dutch)	English, Dutch