horse
noun/hɔrs/ 
beat/flog a dead horse
(informal) to waste your effort by trying to do something that is no longer possiblebeat a dead horseflog a dead horsebe/get on your high horse
(informal) to behave in a way that shows you think you are better than other peoplebe on your high horseget on your high horsechange/switch horses in midstream
to change to a different or new activity while you are in the middle of something else; to change from supporting one person or thing to another
change horses in midstreamswitch horses in midstreamclose, etc. the barn door after the horse has escaped
to try to prevent or avoid loss or damage when it is already too late to do so
close, etc. the barn door after the horse has escapedclose, etc. the barn door after the horse has escaped
to try to prevent or avoid loss or damage when it is already too late to do so
close, etc. the barn door after the horse has escapeda dark horse
a person taking part in a race, etc. who surprises everyone by winning
a dark horseeat like a horse
(informal) to eat a lotShe may be thin, but she eats like a horse.eat like a horse(straight) from the horse's mouth
(informal) (of information) given by someone who is directly involved and therefore likely to be accuratefrom the horse's mouthstraight from the horse's mouthget off your high horse
(informal) to stop behaving in a way that shows you think you are better than other peopleget off your high horsehold your horses
(informal) used to tell someone that they should wait a moment and not be so excited that they take action without thinking about it firsthold your horsesa horse of a different color
(informal) a completely different situation or person from the one previously mentioneda horse of a different colorif wishes were horses, beggars would/might ride
(old-fashioned, saying) wishing for something does not make it happenif wishes were horses, beggars would rideif wishes were horses, beggars might ridea one, two, three, etc. horse race
a competition or an election in which there are only one, two, etc. teams or candidates with a chance of winning
The women's tennis championship was a two horse race between last year's winners New Rochelle and the previous champions Hyde Park.a one, two, three, etc. horse raceput the cart before the horse
to put or do things in the wrong order
put the cart before the horsewild horses would not drag, make, etc. someone (do something)
used to say that nothing would prevent someone from doing something or make them do something they do not want to do
wild horses would not drag, make, etc.wild horses would not drag, make, etc. do