in deep water, jump in with both feet (or jump in headfirst), keep a stiff upper lip

deep in thought, deep sleep, deep breath

Formal and Informal Expressions of deep

In different contexts, you can replace 'deep' with suitable alternatives. In a more formal setting, 'profound, thorough' is apt. In informal speech or writing, 'intense, extreme' is a commonplace synonym.

deep: Explore its Definition & Usage

deep Definition

1extending far down from the top or surface
2having a large distance from the top or surface to the bottom
3very intense or extreme

Using deep: Examples

Take a moment to familiarize yourself with how "deep" can be used in various situations through the following examples!

Example
The pool is too deep for me to touch the bottom.
Example
The ocean is very deep and full of mysteries.
Example
She has a deep love for her family.

deep Synonyms and Antonyms

Synonyms for deep

Antonyms for deep

Idioms Using deep

in deep water
in trouble or difficulty
Example
He found himself in deep water after losing his job.
jump in with both feet (or jump in headfirst)
to start doing something without hesitation or reservation
Example
She decided to jump in with both feet and start her own business.
keep a stiff upper lip
to remain brave and determined in the face of adversity
Example
Even though he was going through a tough time, he tried to keep a stiff upper lip.

Phrases with deep

deep in thought
to be lost in one's own thoughts, to be thinking intently
Example
She was deep in thought, trying to come up with a solution.
deep sleep
a state of sleep that is very sound and peaceful
Example
After a long day at work, he fell into a deep sleep.
deep breath
a breath that is taken slowly and deeply, often used to calm oneself down
Example
She took a deep breath before giving her speech.

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Summary: deep in Brief

The term 'deep' [diːp] refers to something extending far down from the top or surface, having a large distance from the top or surface to the bottom, or being very intense or extreme. It can describe physical attributes such as the depth of a pool or the ocean, or emotional attributes such as a deep love for someone. Phrases like 'deep in thought,' 'deep sleep,' and 'deep breath' are commonly used, while idioms like 'in deep water' and 'keep a stiff upper lip' convey deeper meanings.