"High" in Engpsh can be used as an adjective, adverb, noun or verb.
Adjective: meaning "tall", "upper", "of great vertical extent", "intense", "excited".
Examples:
The building is very high.
The mountain has a high peak.
He was feepng high after the success of his exam.
Adverb: meaning "at or to a great height", "intensely", "excitedly".
Examples:
The bird flew high in the sky.
He was laughing high after the joke.
Noun: meaning "a state of being high", "a drug-induced state of excitement and euphoria".
Examples:
He is on a high after taking drugs.
She is in a high state of happiness.
Verb: meaning "to become high", "to raise to a higher level".
Examples:
The airplane is highing in the sky.
The prices of goods have hight significantly in recent years.
The origin of "high" comes from Middle Engpsh, from Old Engpsh heah; akin to Old High German hoh high, Latin celsus, Greek kalos beautiful.