a (context|of a person) heavier than what is generally considered healthy for a given body type and height.
a (context|transportation|legal|of a vehicle) weighing more than what is allowed for safety or legal commerce
a (context|investment|finance|followed by a noun or prepositional phrase indicating a security or type of security) Having a portfolio relatively heavily invested in.
n (context|especially|transport|legal|healthcare) An excess of weight.
n (context|investment|finance) A security or class of securities in which one has a heavy concentration.
v To place excessive weight or emphasis on; to overestimate the importance of. (defdate|from 17th c.)