Darn a sock or sweater
Word Smith: Darn
“Darn,” said the student. “It’s safer around teachers, than DAMN! They get all wigged out about that word.” I challenged the student to tell me what DARN means. He looked at me quizzically. “What do you mean? It is just an acceptable way to not say a cuss word.”
I had some explaining to do…
As Web Dictionaries define: To darn is to stitch up a small hole in a piece of clothing. Instead of throwing your worn-out socks away, you can just darn the holes in their toes.
When you darn your socks or sweaters, you use a needle and thread to close small holes in the woven fabric. There’s even a specific stitch known as a “darning stitch,” in which you first weave the thread with the grain of the fabric, and then fill in the other “woven” direction. The result is a sturdy patch made only of thread. Darn comes from the Middle French word darner, “to mend.” 
Primary Meanings of darn
You have to go to the Urban Dictionary to find the word darn as a substitute for the word, damn:
- A commonly used substitute for ‘Damn,’ in craptacular American animated series.
- A giant flaming comet speeds towards the archvillian of some cartoon, obviously going to kill or severely injure him.
- Villian: “Oh Darn It!”