***More detailed info on autopens***. This is a review of the article The Elusive Autopen by Kevin Martin. It appeared in _Autograph Collector's Monthly_, Oct 1994. In respecting his copyright, I have chosen not to include it verbatim.
Confidence votes 246. On the mend means recovering, usually from an illness or injury.
Answer Wiki. It means that they think that something has damaged them to the point that they think they need to be fixed. It can also mean they think they've been worn down to a state that they can't fight any more (like a horse that has been broken), but less so than the meaning above.