TOP TO BOTTOM › having a long distance from the top to the bottom: The water is a lot deeper than it seems.
FRONT TO BACK › having a long distance from the front to the back: How deep are the shelves?
one metre/6 ft, etc deep › one metre/6 ft, etc from the top to the bottom, or from the front to the back: This end of the pool is two metres deep.
FEELING › A deep feeling is very strong: deep affection/regret
SOUND › A deep sound is low: a deep voice
SERIOUS › serious and difficult for most people to understand: a deep and meaningful conversation
a deep sleep › when someone is sleeping in a way that makes it difficult to wake them up
COLOUR › A deep colour is strong and dark: deep brown eyes
take a deep breath › to fill your lungs with air: Take a deep breath and relax.