What is the definition of nagsisiyasat in Tagalog?

"Nagsisiyasat" in Tagalog means investigating or inquiring. It is the present tense of the verb "siyasatin," which means to investigate.

Here are some other possible translations for "nagsisiyasat":

* examining

* scrutinizing

* researching

* probing

* exploring

Examples:

* Ang pulis ay nagsisiyasat sa krimen. (The police are investigating the crime.)

* Nagsisiyasat siya sa kasaysayan ng pamilya niya. (She is researching her family history.)

* Ang mga siyentipiko ay nagsisiyasat sa mga sanhi ng sakit. (Scientists are investigating the causes of the disease.)

Note: The term "nagsisiyasat" is often used in a formal context. In casual conversation, you might use other verbs like "tinatanong" (asking), "pinag-aaralan" (studying), or "sinusuri" (examining) to convey a similar meaning.