1. To conclude or finish in a weak, disappointing, or anticlimactic manner, without the expected impact or significance
The movie had great potential but ended with a whimper, leaving audiences disappointed.
O filme tinha grande potencial, mas terminou com um gemido fraco, deixando o público desapontado.
2. To finish something important without proper recognition or fanfare; to fade away quietly
His once-successful career ended with a whimper after the scandal.
Sua carreira outrora bem-sucedida terminou de forma lamentável após o escândalo.