oh dark thirty
Some unspecified hour in the early morning (implying an unpleasant time to be awake).
I had to get up at oh dark thirty to catch a plane.
VERBS
be, look
get, go, grow
As evening fell, the room grew dark and we had to turn on the lights.
remain, stay
ADV
very | completely
almost, nearly
By the time we finished dinner, it was almost dark outside.
quite, rather
ADJ
pitch
When the power went out, the room became pitch dark and we couldn't see anything.
gathering
As evening fell, the gathering dark made it difficult to see the path ahead.
PREP
after ~
My parents never let us play outside after dark when we were children.
before ~
We need to get back to the hotel before dark falls.
in the ~
Children often feel scared when they play in the dark without any lights.
PHRASES
afraid of the dark
My little brother still sleeps with a night light because he's afraid of the dark.