This is the 2153rd most frequent Dutch word.
kloppen
To knock; to beat; to be correct.
Here, 'kloppen' means 'to be correct' or 'to be accurate'.
De klok klopt niet.
The clock is not correct.
In this context, 'kloppen' means 'to knock'.
Ik klop op de deur.
I knock on the door.
Here, 'kloppen' indicates that something is consistent or logical.