intransitive verb
Definition: To see, hear, or feel something that is not actually there, often due to a mental health condition or the effects of drugs.
Example: After staying awake for too long, he began to hallucinate and saw strange shapes in the shadows.
transitive verb
Definition: To make someone experience things that are not real, often due to a mental condition or substance use.
Example: The drug can cause people to hallucinate, seeing things that aren't there.