Meaning of the word "deep six" in English

What does "deep six" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

deep six

US /diːp sɪks/
UK /diːp sɪks/

Idiom

to get rid of something; to discard or dispose of something permanently

Example:
The company decided to deep six the old project and start fresh.
He had to deep six his plans after the unexpected changes.