Here are a few words that might have interesting history but, if so, I couldn’t find any. They do make the language more vivid, though.
Old hat — predictable, old-fashioned, hackneyed, trite, uninteresting
Bang your head against the wall — waste time in a hopeless enterprise
Lose your head — lose control of your emotions
A shoulder to cry on — someone willing to hear your problems and offer sympathy
Kiss my ass — an expression of disdain or dismissal
Sitting pretty — lucky, or in an easy, favorable situation
Cheek by jowl — close together, side by side, cheek to cheek.
Knucklehead — a stupid person
Numskull — a stupid person
Out of earshot — too far away to hear (1600)
All thumbs — clumsy, awkward, uncoordinated (1546)
Pull your socks up — a warning to correct one’s behavior, to be prepared
Knock your socks off —
If something “knocks your socks off,” you’re amazed or impressed or surprised. The phrase appeared around the mid-1800s, when it meant to beat someone so badly that he’d have not only his shoes knocked off, but his socks as well. Then the meaning softened to simply “decisively defeat,” as in an election, and today is used more often in the positive sense of “amazing or impressing.” It may once have been connected to the expression, “knock your block off,” which does mean to hit someone very hard.
I don’t wear socks, so where does that leave me?