To estimate something as being less than its actual value.

To regard someone as less capable or intelligent than they really are.

किसी को उनकी वास्तविक क्षमता या बुद्धिमत्ता से कम समझना।

English Usage: Don't underestimate her; she has a lot of potential.

Hindi Usage: उसे कम मत आंका; उसके पास बहुत संभावनाएँ हैं।