Definition of deep six
: a place of disposal or abandonment —used especially in the phrase give it the deep six
Origin and Etymology of deep six
from the leadsman's call by the deep six for a depth corresponding to the sixth deep on a sounding line
First Known Use: 1929See Words from the same year
Seen and Heard
What made you want to look up deep six? Please tell us where you read or heard it (including the quote, if possible).