I saw this fabulous photo online yesterday:

Window washers at a children’s hospital. Love it.
What I don’t love is the text under the photo:

It should read “window-washers… rappel down the side…”
Rappel means “the act or method of moving down a steep incline or past an overhang by means of a double rope secured above and placed around the body.”
Repel, on the other hand, means “to thrust back or away (an assailant); to resist effectively (an attack); and to keep off or out, to fail to mix with.”
The photo and text are from the blog of a major newspaper’s photography department. I am disappointed that no one caught that error.