1. horse (noun) =
(a)

a frame or device with four legs, used for supporting something
(b) heroin (= an illegal & harmful drug (medicine) taken by some people for pleasure)

a vaulting horse/pommel horse
2. a vaulting horse (noun) = a wooden frame (stand), used for doing gymnastics
3.
a blood horse = a well-bred person
4. a dark horse = a person whose abilities are hidden or not known to others
5. stalking horse = a false outward appearance used to hide some secret mission, project, etc.
6. war-horse =
(a) an old, retired soldier, full of war stories
(b) a tough, frightening woman
7. (a) horse and man = (of something) completely
(b) horse and foot
8. horse and cart = (Cockney rhyming slang) fart; to break wind (= to send out gas or air though anus, usually foul smelling and with sound)
9. white horse = (said of something as) a sign of cowardice
10. horse godmother = a tall, clumsy woman with male features
11. horse feathers [an exclamation used when dismissing something contemptuously (with a very cheap, mean idea or opinion)]
12. horse-kiss =
(a) a rough kiss
(b) a pretended kiss, but actually a bite
13. horse-laugh = loud and impolite laugh
14. horse sense = plain, practical common sense
15. white horses [said of the white froth and spray on the rough sea waves (supposed to be the manes of the horses of Poseidon, the sea god – from a Greek mythical story)]
16. horses for courses [said to mean that what is suitable or best for a person might not be suitable or best for another person; choosing a person best suited for a particular job on hand; each person or thing will perform best under conditions which suit his/her/its particular nature(?)]
17. horse-play = noisily cheerful and rough play
18. pretty horsebreaker = a prostitute, usually supported by wealthy lovers (suitors) (‘prostitute’ = a woman who has sex with any man for money)
19. (A) horse-nails =
(a) money
(b) tadpoles (baby frogs)
(B) to a make a horse-nail of … = to do something clumsily, i.e. not properly
(C) to knock into horse-nails = to defeat (someone) without doubt
20. (a) willing horse = a person who helps others without any complaint
(b) all lay their load on the willing horse [said to point out that a worker who works without any complaint is made to work more and more; the worker is exploited]

a Trojan horse
21. Trojan horse = (a) a person or a thing introduced into a system or an organisation, as a part in order to undermine or spoil the entire system or organisation
(b) a malware in a computer; a computer worm or virus
22. hobby-horse =

a hobby-horse
(a)
a wooden toy horse for children to play
(b) a pet theory or some activity taken up only just for fun, and may be given up or discarded soon (not a serious activity)
23. horse opera = a fictional story or film about the life, cattle farms, horses and gun fights in the west in olden times (wild west stories or films)
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