Deep Water Meaning

(idiomatic) A difficult or embarrassing situation.

Example: Waters suitable for deep-draft ships, especially ocean-going.
1940, Federal Writers' Project, Texas: A Guide to the Lone Star State‎, page 71:
  But deep water was not secured until 1926, when Corpus Christi dug itself out 21 miles to the sea.
  You will be in deep water if you are found copying from other dictionaries.