spike

In a violin-family instrument, the carved wooden plug which sits in the bottom block of the instrument.

The spike of a cello or double bass that makes contact with the floor and supports the weight of the instrument.

A sort of very large nail.

A piece of pointed metal etc. set with points upward or outward.

"The trap was lined with spikes."

Anything resembling such a nail in shape.

To fasten with spikes, or long, large nails.

"to spike down planks"

To set or furnish with spikes.

To embed nails into (a tree) so that any attempt to cut it down will damage equipment or injure people.