It's a good word, although it's past-tense. Someone has built out a site on the .co, so you're not the only one that thinks it's a good word. Underpin .com also has a site.
If this were my name I would let it sit around in the 5-10K BIN range. Looks like you have it listed lower, which is a fair price. It really depends on how fast you want to sell it.
It spent the last 8-10 years parked for sale, so not sure it has many prospects. As Barman says, the .CO owner did something with that, so maybe sell it to them ? Trying to think of another buyer, but it sounds negative. Might be a domainers name.
Thanks for the feedback, picked up the name about 1 week ago. Already had an offer from .co owner but low 4 figures. I think it's worth more. I am also aware of underpinnedinc in king recently put into action!