A tall, thin person.
The pole that holds up a light so it can illuminate a wide area, such as holds up a streetlight.
An underweight person.
The state or quality of being underweight.
An underweight investment.
To underestimate the weight of.
To give insufficient weight to (a consideration); to underestimate the importance of.
To invest in less than conventional wisdom would dictate.
Being less invested in a particular area than market wisdom suggests.
Of an inappropriately or unusually low weight.
Not too heavy for an intended purpose.