I've reported that my answer 'a tip' should be allowed, I think it's a suitably equivalent word, what do others think?
Hmm, does 'a tip' cover the same amount of dirt as a 'a dump', or is it just very untidy...?
this one could run and run! I think of them as about the same, but that's vernacular for you...
Just learn it as:
- twll o le - a dump
With idiomatic expressions such as this there is little point in learning the individual bits - it doesn't often help with the idiomatic meaning at all. You can always look up individual words in one of the on-line or app dictionaries that we recommend.