睹 is a literary verb meaning 'to see' or 'to witness'. You'll rarely find it alone in modern spoken Chinese — it almost always appears in fixed expressions and compounds like 目睹 ('to witness with one's own eyes'), 有目共睹 ('obvious to all'), and 睹物思人 ('to see a thing and think of the person'). In formal or classical contexts, 睹 carries the same gravity as 'behold' or 'set eyes on' in English.