The thick, soft undercoat of some mammals, especially those that spend time in the water

Having a layer of underfur.

plural of underfur

Inadequately furnished; lacking in furniture.

(transitive) To supply with less than enough; to furnish insufficiently.

present participle of underfurnish

simple past tense and past participle of underfurrow

present participle of underfurrow

(transitive) To cover as if under a furrow; to plough in.

Under a furrow.