Definitions

1. noun

A hole or shaft dug for mining, or a hole or shaft in the ground, especially one that has been abandoned or is no longer used.

“The old mine was filled with ratholes, posing a significant hazard to hikers in the area.”

2. noun

A project or investment that appears promising at first but proves to be unproductive or unsuccessful.

“The company’s latest venture turned out to be a rathole, losing them thousands of dollars in the process.”