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1
flat and level; going across and parallel to the ground rather than going up and down horizontal lines
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- 2(informal) I was so tired, I just wanted to be horizontal (= lying down). compare vertical
NAmE//ˌhɔrəˈzɑntəli//, NAmE//ˌhɑrəˈzɑntəli//
adverb Cut the cake in half horizontally and spread frosting on one half.See horizontal in the Oxford Advanced Learner's DictionaryCheck pronunciation: horizontal