horizon
noun /həˈraɪzn/
/həˈraɪzn/
Idioms 
enlarge imagethe horizon[singular] the furthest that you can see, where the sky seems to meet the land or the sea- The sun sank below the horizon.
- A ship appeared on the horizon.
Extra ExamplesTopics Weatherc1, Geographyc1- I watched the pale sun climb over the horizon.
- Land was still out of sight beyond the horizon.
- The captain scanned the horizon for any sign of other vessels.
- The moon was rising over the horizon.
- The sea stretched away to the distant horizon.
- The sun was sinking rapidly below the western horizon.
Oxford Collocations Dictionaryadjective- northern
- southern
- etc.
- …
- scan
- above the horizon
- below the horizon
- beyond the horizon
- …
- [countable, usually plural] the limit of your desires, knowledge or interests
- She wanted to travel to broaden her horizons.
- The company needs new horizons now.
Extra Examples- They had become aware of possibilities beyond their own limited horizons.
- Their horizons were limited to events within the town community.
- My first trip to the theatre broadened my cultural horizons.
- It is hoped that the course will open up new horizons for students.
- His horizons didn't stretch beyond his next game.
- Her trips to Asia have broadened her cultural horizons.
Oxford Collocations Dictionaryadjective- limited
- narrow
- new
- …
- broaden
- expand
- open up
- …
- stretch
- beyond your horizon
Word Originlate Middle English: via Old French from late Latin horizon, from Greek horizōn (kuklos) ‘limiting (circle)’.
Idioms
on the horizon
- likely to happen soon
- There's trouble looming on the horizon.