To weigh down: to put too heavy a burden on.
To place excessive weight or emphasis on; to overestimate the importance of.
(of a person) heavier than what is generally considered healthy for a given body type and height.
(of a vehicle) weighing more than what is allowed for safety or legal commerce.
(investment, followed by a noun or prepositional phrase indicating a security or type of security) having a portfolio relatively heavily invested in.
Example: "Our portfolio is very overweight (in) asian technology stocks."