It's not hard to define "sell," Varma, and I'm sure you don't want to do it, because the definitions aren't flattering. Here's the Miriam Webster definition:
1: to deliver or give up in violation of duty, trust, or loyalty and especially for personal gain : betray —often used with out
sell out their country
2a(1): to give up (property) to another for something of value (such as money)
2a(2): to offer for sale
2b: to give up in return for something else especially foolishly or dishonorably
sold his birthright for a mess of pottage
2c: to exact a price for
sold their lives dearly
3a: to deliver into slavery for money
3b: to give into the power of another
sold his soul to the devil
3c: to deliver the personal services of for money
4: to dispose of or manage for profit instead of in accordance with conscience, justice, or duty
sold their votes