Why We Say: Hair of Dog to Ham Actors
Moving from “G” to “H” in sayings gleaned from Dictionary of Word Origins by Jordan Almond, we explore the following:
Hair of the Dog: today this refers to taking a drink to combat the morning after over indulgence; however, it originally referred to taking a hair from the dog that inflicted the damage and placing into the wound. Connection? Both cures deal with the logic-deprived means of dealing with a bite.

Going off half-cocked alludes to pursuing a line of action and not being prepared, with the result being less than satisfactory, which is derived from the original meaning of hunters carrying their gun at half cock for safety reasons, yet not fully engaging back into lock and loaded when ready to shoot. Both instances are from not taking “ready, aim, fire” seriously.
Ham actors are known today as those who overact, not being of high caliber in their theatrical attempts. This terms stems from the long ago practice of applying ham fat to the face to more easily remove the burnt cork used to create blackface, a part of a stage comedian’s routine. A ham actor comes from “hamfatter”—not a compliment. Hogging the stage is another aspect.

Handwriting on the wall is a portent of doom and goes back to the rule of Belshazzar. In Daniel 5 the words “Mene, Mene, Tekel, Upharsin“ appeared on the wall announcing the end of Belshazzar’s kingdom.
Hangout usually refers to a place where people gather or getting together and it stems from the phrase “Where do you hang out your sign?” which was the question professionals, artisans, and tradesmen would ask one another when inquiring about their their business.
Hard up is a tough place to be since it means being broke and hanging in the wind and that makes sense since the nautically inclined know that to put the helm hard up is to turn the ship away from the wind. So if a person is “hard up” it’s doubtful they can handle the financial storms that come up now and then.
Harping on a subject, going over the same subject repetitively is much like playing one string on the harp—not pleasant and somewhat annoying.

If something is “haywire” it usually indicates it’s broken, and that’s from the logging camp days when loggers would take the wire from hay bales to mend equipment.
If you are known to wear your heart in your sleeve, you probably show your emotions easily. In the days of chivalric knights, a knight would tie a scarf from his lady love around his arm to indicate his favor—all would see where his heart lay.
If someone is on their “high horse” he or she is acting superior, and in those yesteryear days of transportation, someone riding high up on their horse was definitely superior to those having to walk.

More “H” sayings next month…
Oh, I’ll be using that ham explanation. Thanks!
It explains a bit some present actors perhaps
The ham one got me, too. The others seemed easier to connect with their roots.
Hamlet is now oh so different for me…