be whistling in the dark

to be confident that something good will happen when it is not at all likely She seems pretty sure she'll win the title, but she may just be whistling in the dark.

Common Names:

Name	Pronounced	Usage
Borislav	bah-ree-SLAHF (Russian)	Bulgarian, Serbian, Croatian, Slovene, Russian, Medieval Slavic
Ava	['avə]
Aabraham	AH:B-rah-hahm	Finnish
ZbynĚK	-	Czech
Tyron	-	English
Nobuyuki	no-boo-yoo-kee	Japanese