dive

An informal term for a cheap, disreputable, and often dark bar or club.

"Let's go to that old dive."

To plunge headfirst into water, often as a sport or recreation.

"She will dive into the pool."

An act of plunging headfirst into water, especially in swimming.

"He performed a perfect dive."

To move quickly and suddenly downwards or in a specific direction.

"The plane began to dive rapidly."