nachhaken
Nachhaken is a German verb meaning to press for further information by asking follow-up questions, often to clarify a point or to obtain additional details after something has been stated. The term is formed with the prefix nach- attached to the verb haken (to hook), and it is a separable-prefix verb, so in present tense you say Ich hake nach, and in perfect you say Ich habe nachgehakt.
Usage is common in interviews, journalism, meetings, negotiations, and customer service, where speakers want to elicit
In practice, nachhaken can be as simple as asking for a clarification or as forceful as demanding