... lexicographer Kory Stamper, who writes and edits dictionary definitions for Merriam-Webster, wants it known that bigly is a real word — even if it’s not the word Trump meant to use.
Stamper offers a brief history of the word bigly. This adverb came into use around 1400 and stuck around for roughly 500 years. It has been used two different ways over the centuries.
The first meaning, says Stamper, was to mean “with great force or violently or strongly.” It appeared in such fashion in the classic King Arthur tale Le Morte d’Arthur, published way back in 1485: “So roughly and so bigly that none might withstand him,” wrote Sir Thomas Malory.
The second meaning, which has been more popular in recent centuries, means “boastfully, haughtily or proudly.” Thomas Hardy put it to use in his 1874 novel Far From the Madding Crowd: “I don’t see that I deserve to be put upon and stormed out for nothing, concluded the small woman bigly.”
So, yes, let's cut taxes with great force, indeed.