To Dope

1. (transitive, slang) To affect with drugs. Synonym: administer
2. (transitive) To treat with dope (lubricant, etc.).
3. (transitive, electronics) To add a dopant such as arsenic to (a pure semiconductor such as silicon).
4. (intransitive, now chiefly sports) To use drugs; especially, to use prohibited performance-enhancing drugs in sporting competitions.
5. (slang, transitive, dated) To judge or guess; to predict the result of.