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
Lauretta	[lɔ:'retə]
BoŽO	BO-zho	Croatian, Serbian, Slovene
Fishel	-	Yiddish
Beatriu	-	Catalan
Astra	AS-trə	English (Rare)
Auld	[ɔ:ld]