From Longman Dictionary of Contemporary Englishget heavy (with somebody)get heavy (with somebody)informal to start behaving in a threatening or strict way He came round and started getting heavy about the money I owed him. → heavy
Examples from the Corpus
get heavy (with somebody)• Clouds of steam from the dishwasher filled the room when the going got heavy.• It was time for the regulators to get heavy.• It also offers a very impressive solution to one of guitar recording's biggest problems: getting heavy distortion on to tape.• Prices will vary from area to area and if we get heavy rain supplies will fall, forcing prices to rise.• Don't get heavy, said headvoice.• Only a dozen or so of the creeps in the black nighties, but they've got heavy weapons. 