This is the 608th most frequent Dutch word.
dicht
Closed.
Here, 'dicht' indicates the state of being closed.
De deur is dicht.
The door is closed.
In this sentence, 'dicht' means 'close' or 'near' in terms of proximity.
Hij woont dicht bij het park.
He lives close to the park.
In this context, 'dicht' is combined with 'doen' to form 'dichtdoen', meaning to close.