potichu
(tiše) quietly, (mluvit) in a low/quiet voice, (nehlučně) noiselessly
Buď potichu!
Be quiet!
Potichu prošel chodbou...
He quietly walked through the hallway...
hɪ ˈkwaɪətlɪ wɔːkt θruː ðə ˈhɔːlˌweɪ
Řekla to potichu.
She said it in a low voice.
Pusť to, ale (jen) potichu.
Switch it on but keep it down.