noun
BAD : If you are caught dropping junk in the street, you are fined.
GOOD : If you are caught dropping litter in the street, you are fined.
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junk = (informal) anything that you consider to be worthless or useless: 'The garden shed was full of old junk that hadn't been used for years.'
litter = things such as empty packets, cans and bottles that are left in a public place: 'You can be fined up to £100 for dropping litter.'