to ascertain; to confirm; to verify; to make sure of
to inquire (about); to enquire; to ask; to interrogate; to question intensely; to grill (someone about something)
searching examination; establishing the facts through thorough examination
to find out the truth; to ascertain; to clarify; to confirm; to verify
censure; denunciation; (verbal) attack; blaming
to go to the bottom of an affair; to inquire into the origin
to go to the bottom of an affair; to inquire into the origin