This is the 106th most frequent Dutch word.
zeggen
To say.
Here, 'zeggen' is used to indicate the act of verbally expressing something directed towards another person.
Ik wil iets tegen je zeggen.
I want to say something to you.
In this sentence, 'zeggen' is a verb in question form, asking about what the person is articulating or expressing.
Wat zeg je?
What are you saying?
Here, 'zeggen' is used to request repetition of what was said, emphasizing the speech act.