the region of the atmosphere and outer space seen from the earth, the apparent dome over the earth on which the sun, stars, and clouds appear

out of a clear sky, under the same sky, the sky's the limit

Formal and Informal Expressions of sky

In different contexts, you can replace 'sky' with suitable alternatives. In a more formal setting, 'atmosphere, firmament' is apt. In informal speech or writing, 'blue yonder' is a commonplace synonym.

sky: Explore its Definition & Usage

sky Definition

1the region of the atmosphere and outer space seen from the earth
2the apparent dome over the earth on which the sun, stars, and clouds appear

Using sky: Examples

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

Example
The sky was clear and blue.
Example
The sun was setting in the western sky.
Example
The stars were shining brightly in the night sky.

sky Synonyms and Antonyms

Synonyms for sky

firmament
heavens
vault of heaven
celestial sphere

Phrases with sky

out of a clear sky
unexpectedly and without warning
Example
He resigned out of a clear sky, leaving everyone surprised.
under the same sky
in the same world or situation
Example
No matter where we are, we are always under the same sky.
the sky's the limit
there is no upper limit to what can be achieved or attained
Example
With hard work and dedication, the sky's the limit for your career.

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Summary: sky in Brief

The term 'sky' [skaɪ] refers to the region of the atmosphere and outer space seen from the earth. It is the apparent dome over the earth on which the sun, stars, and clouds appear. Phrases like 'out of a clear sky' denote unexpected events, while 'the sky's the limit' implies no upper limit to what can be achieved.