whistle in the dark
US /ˈhwɪs.əl ɪn ðə dɑːrk/
UK /ˈhwɪs.əl ɪn ðə dɑːrk/

1.
fischiettare nel buio, farsi coraggio
to try to make yourself feel more confident or less afraid by pretending to be brave or cheerful
:
•
He was just whistling in the dark, trying to convince himself that everything would be fine.
Stava solo fischiettando nel buio, cercando di convincersi che tutto sarebbe andato bene.
•
Despite his brave words, I could tell he was just whistling in the dark about the company's future.
Nonostante le sue parole coraggiose, potevo dire che stava solo fischiettando nel buio riguardo al futuro dell'azienda.