Definitions

1. verb

to sink or go down into something, especially a hole or a cavity

“The fish insunk into the murky depths of the ocean.”

2. verb (transitive)

to cause something or someone to sink or go down

“The strong wind insunk the boat into the water.”

3. noun

a hole or a cavity, especially one in the ground

“The insunk was deep and narrow, making it difficult to climb out.”