all of the “real” Martial arts from back before guns were about using weapons. those aren’t really practiced as much anymore because they’re all useless in the face of firearms anyway. why spend years training with a knife when the same time could be spent training with a gun. if combat effectiveness is your goal then you need to learn modern combat techniques.
that said, there’s plenty to be learned from it, and it’s not like it can’t help you in a fight. but as another commenter said, the real way to win every fight is by avoiding them. so really the best thing to learn is de-escalation and recognizing danger.
we still have a couple of lemon giving phrases that survive “when life gives you lemons”. “looks like that car you bought is a lemon”
lemons are sour instead of sweet like most fruit. my guess is that a lemon is a thing to generally make your day/life worse, especially if it seemed like a good thing at first.
makes sense in the context of a “confirmed bachelor”. he’s giving that lemon to a stork. he’s not going to have children. someone married him and he’s not going to have children. back in the day that would be seen as defeating the point of marriage, though the real implication is he’s gay and married for a beard.
in the context of other relationships or a breakup they thought they were dating someone for keeps, turns out they weren’t worth it. they were a lemon, looked sweet but tasted sour when bitten into.