To Have

1. (transitive) To possess, own.
2. (transitive) To hold, as something at someone's disposal.

(not necessarily one's own key)

3. (transitive) To include as a part, ingredient, or feature.
4. (transitive) Used to state the existence or presence of someone in a specified relationship with the subject.
5. (transitive) To partake of (a particular substance, especially food or drink, or action or activity).
6. (transitive) To be scheduled to attend, undertake or participate in.
7. To experience, go through, undergo.
8. To be afflicted with, suffer from.
9. (auxiliary verb, taking a past participle) Used in forming the perfect aspect.
10. Used as an interrogative verb before a pronoun to form a tag question, echoing a previous use of 'have' as an auxiliary verb or, in certain cases, main verb. (For further discussion, see the appendix English tag questions.)
11. (auxiliary verb, taking a to-infinitive) See have to.
12. (transitive) To give birth to.
13. (usually passive) To obtain.
14. (transitive) To engage in sexual intercourse with.
15. (transitive) To accept as a romantic partner.
16. (transitive with bare infinitive) To cause to, by a command, request or invitation.
17. (transitive with adjective or adjective-phrase complement) To cause to be.
18. (transitive with bare infinitive) To be affected by an occurrence. (Used in supplying a topic that is not a verb argument.)
19. (transitive with adjective or adjective-phrase complement) To depict as being.
20. (Britain, slang) To defeat in a fight; take.
21. (Britain, slang) To inflict punishment or retribution on.
22. (dated outside Ireland) To be able to speak (a language).
23. To feel or be (especially painfully) aware of.
24. (informal, often passive) To trick, to deceive.
25. (transitive, in the negative, often in continuous tenses) To allow; to tolerate.
26. (transitive, often used in the negative) To believe, buy, be taken in by.
27. (transitive) To host someone; to take in as a guest.
28. (transitive) To get a reading, measurement, or result from an instrument or calculation.
29. (transitive, of a jury) To consider a court proceeding that has been completed; to begin deliberations on a case.
30. (transitive, birdwatching) To make an observation of (a bird species).

Usage notes

In certain dialects, expressions, and literary use, the lexical have need not use do-support, meaning the sentence Do you have an idea? can also be Have you an idea? This makes have the only lexical verb in Modern English that can function without it, aside from some nonce examples with other verbs in set phrases, as in What say you?, and aside from the verb 'be' where this is considered lexical. The auxiliary have which forms the perfect tense never uses do-support, so Have you seen it? cannot be Do you have seen it?.