What is the meaning of Under_the_influence?

While intoxicated or inebriated, in any degree from mildly impaired to stupefied, by a mind-altering substance, typically alcohol; thus, especially, drunk.

Intoxicated or inebriated, in any degree from mildly impaired to stupefied, by a mind-altering substance, typically alcohol; thus, especially, drunk.

Source: wiktionary.org