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"To rubbish" is a very common verb, at least in British English.

Is it transitive? As an American I know the word, but rubbish as a verb is utterly unfamiliar.

Yes. "I rubbished his proposal", i.e. "I criticised his proposal".

(I can't imagine what an intransitive 'rubbish' would mean!)

Thanks, that makes the parallels with "trash" clear. I could have chosen a better example.