It's a racket sport like Tennis, but played with a small rubber ball instead. Quite popular in Wales :)
It's basically what the y...Americans call Racquetball but with a smaller ball. Maybe I'm thinking of my own family but seems like it's not as popular as it was in the 1990s.
I live in Carmarthen and I think squash is less popular than rugger, soccer, tennis, skateboarding, cricket, bowls, cycling, horse riding, motorbiking, trotting, swimming, running, hiking, climbing, and water polo.
If you mean what in Britain is usually called a courgette, then:
- courgette (courgettes) - just sticking with the same ?French loan-word
- corbwmpen (corbwmpenni) = small pumpkin/marrow
I always assumed it was onomatopoeic because it resembles the sound the ball makes hitting the wall, but the Geiriadur Mawr has the word "sbonc" meaning a leap or jerk. So I suspect that's actually the origin. However, the Welsh do like playing with words, so I think the sound probably comes into it too. :)