I think this is the issue between North American and British English. North Americans very rarely use the word "toilet" unless they're referring to the actual porceline fixture. I'd go as far as to say it's generally considered uncouth to say that you are "going to the toilet" (unless you were specifically discussing bodiky functions). It's much more common to say that you are "going to the bathroom, even if you have no intention of bathing. So, it might be a good idea to allow" bathroom for tŷ bach.
so obviously this is actually small house, and ty bach is an idiom for toilet - in which case should 'bathroom' etc be accepted too?
I wouldn't say so, at least it's not a great translation. It's better to think "Toiled/Tŷ bach" as "Toilet" and "Ystafell ymolchi" as "Bathroom".
yes, this is one of the instances where i just can't divorce my american english from the british english. i'll probably instinctively first go to 'bathroom' when seeing 'ty bach' forever.
So, if my house is small and I say "dw i'n preswyliaf yn tŷ bach", will I be understood in context, or will I give the impression that I reside in a toilet?
Well you'd probably get more of a strange look for saying "Preswyliaf". We actually use "byw". So "Dw i'n byw mewn tŷ bach" would be the correct sentence. Since the context is clear nobody would mistunderstand you.
You say that, but my mother was laughed at when she said exactly this when learning Welsh (in Wales) at school. I was told that "tŷ bychan" would avoid confusion.
Man, I try to use the GPC and I end up sounding like a dictionary. Diolch yn fawr!
Yeah I'd recommend you try other dictionaries like "Y gweiadur" or "Ap geiriaduron". GPC, is a great dictionary but it's more for first language/fluent speakers. If you can't find a word else where then it is worth looking up GPC, but just remember that it's got a lot of different varieties of words some of which are old fashioned or really formal.
I take it this would be used to refer to the room that the toilet is in, not for the toilet itself.
Try adding lle chwech! Ha ha came across that in a book and I was totally confused til I looked it up! Anyone tell me the origins of that phrase please? Would love to know!
This is a dialect expression used in parts of Wales. In this context, chwech means 'sweet(-smelling)'!