whistle past the graveyard

Translations
свистеть мимо кладбища
Someone is just whistling past the graveyard, pretending everything is fine.
Кто-то просто свистит мимо кладбища, притворяясь, что всё в порядке.
Definitions
To act as if something is not a threat or to ignore a potentially dangerous situation, often by being overly cheerful or carefree, in order to avoid confronting fear or anxiety.