below zero

Translations
ниже нуля
Temperatures dropped below zero last night.
Температура опустилась ниже нуля прошлой ночью.
Definitions
A temperature that is less than zero degrees, typically referring to temperatures below the freezing point of water (0°C or 32°F). It can also be used metaphorically to describe something extremely low or negative.
Words
below

preposition
ниже
zero

noun
нуля