Meaning of HORIZON in English
ho ‧ ri ‧ zon /həˈraɪz ə n/ BrE AmE noun
[ Date: 1300-1400 ; Language: Late Latin ; Origin: Greek , from horizein 'to limit' ]
1 . the horizon the line far away where the land or sea seems to meet the sky
on the horizon
We could see a ship on the horizon.
► Do not say ‘in the horizon’. Say on the horizon .
2 . horizons [plural] the limit of your ideas, knowledge, and experience
broaden/expand sb’s horizons
a course of study that will broaden your horizons
3 . on the horizon to seem likely to happen in the future:
Business is good now, but there are a few problems on the horizon.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012