the saltwater that covers most of the earth's surface and surrounds its landmasses, a particular expanse of saltwater, especially a sea smaller than an ocean

a drop in the ocean, in deep water, make waves

dead sea, high seas, seven seas

Formal and Informal Expressions of sea

In different contexts, you can replace 'sea' with suitable alternatives. In a more formal setting, 'ocean' is apt. In informal speech or writing, 'big blue, drink' is a commonplace synonym.

sea: Explore its Definition & Usage

sea Definition

1the saltwater that covers most of the earth's surface and surrounds its landmasses
2a particular expanse of saltwater, especially a sea smaller than an ocean

Using sea: Examples

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

Example
The sea was calm and peaceful.
Example
The Mediterranean Sea is located between Europe and Africa.
Example
We went for a swim in the sea.
Example
The ship sailed across the sea for weeks.

sea Synonyms and Antonyms

Synonyms for sea

Antonyms for sea

Idioms Using sea

a drop in the ocean
a very small amount compared to what is needed or expected
Example
The donation was appreciated, but it was just a drop in the ocean compared to what was needed to fund the project.
in deep water
in trouble or difficulty
Example
He got himself in deep water when he lied to his boss about finishing the project.
make waves
cause a disturbance or controversy
Example
The new policy made waves among the employees, who felt it was unfair.

Phrases with sea

dead sea
a salt lake bordered by Jordan to the east and Israel and Palestine to the west, known for its high salt content and therapeutic properties
Example
Many people travel to the Dead Sea to experience its healing properties.
high seas
the open ocean outside of any country's territorial waters
Example
The pirates were caught on the high seas and brought to justice.
seven seas
all the world's oceans considered as a single entity
Example
He sailed the seven seas in search of adventure.

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Summary: sea in Brief

The term 'sea' [siː] refers to the saltwater covering most of the earth's surface and surrounding its landmasses. It can also refer to a particular expanse of saltwater, exemplified by 'We went for a swim in the sea.' 'Sea' extends into phrases like 'dead sea,' and idioms like 'in deep water,' denoting trouble or difficulty, and 'make waves,' meaning to cause a disturbance.