This is the 14940th most frequent German word.
sagst
"Say" (second-person singular, present tense of "sagen").
The word 'sagst' is used here in the present tense, referring to a direct conversation where the second person singular is being addressed.
Was sagst du dazu?
What do you say about that?
In this sentence, 'sagst' is used to denote a habitual action, again in the present tense for the second person singular.
Immer wenn du etwas sagst, höre ich gerne zu.
Whenever you say something, I enjoy listening.
The word 'sagst' is questioning a lack of action in the present tense and second person singular.