trump up

present singular third person trumps up · participle present trumping up · participle past trumped up · past trumped up

1. idiomaticTo create falsely, to fabricate (particularly applied to accusations, (legal) charges or evidence).

   His electoral "campaign" to date has included attempts to trump up criminal charges against his opponents.

   1 more example

   Those of the men who had swapped horses with passing drovers, without the exchange of receipts, were busy all afternoon trumping up witnesses.

   1902, Barbara Baynton, edited by Sally Krimmer and Alan Lawson, Bush Studies (Portable Australian Authors: Barbara Baynton), St Lucia: University of Queensland Press, published 1980, page 67

2. idiomaticto heavily publicise, promote or market a product.

   We don't often trump up products purely for the virtue of being "new".