What is "semiretired"

Usage examples of "semiretired".

Every islet in those parts, natural or engineered, has been taken over by some semiretired engineer avid to turn it into his own little Garden of Eden.

But nobody in his right mind would climb to the top of a University bell tower to take potshots with a scopesighted rifle at passersby, either, her mind retorted, or murder perfectly innocent, semiretired rock'n'roll stars just to say they'd done it, or do any of the other gruesome things that had made the headlines within her memory.