Have a field day means to extract excitement or gain an advantage from a situation, particularly a situation that is detrimental to someone else. Originally, field day was a military term that referred to a day dedicated to military maneuvers, as these military maneuvers occurred in actual fields. During the 1800s the term field day came to mean any day during which exciting or big events occurred. Today, having a field day most often describes excitement or gaining an advantage from a situation that proves detrimental to someone else. Related terms are had a field day, having a field day.
If that doesn’t happen, I’m afraid the scoffers will have a field day declaring that the plea has no teeth. (The National Catholic Reporter)
As miscreants have a field day during the Holi week, women dread stepping out of their homes. (The Times of India)
Social media users had a field day with the howler, and were quite unforgiving with their responses. (The Scottish Daily Record)
The respective Swedish and German owners of the tankers Fanny and Willy should have been relieved that there was never an incident involving both ships, or the headline-writers would have had a field day. (The Telegraph)
The online environmental magazine Grist is one of the many publications having a field day with Trump. (The Huffington Post)
I never thought I would use this term, but OMG, is the biased media having a field day blaming Donald Trump for what apparently are hired provocateurs begetting violence at his rallies. (The Reno Gazette-Journal)
The Internet is having a field day analyzing Chris Christie’s pained expressions as he stood behind Donald Trump giving a victory speech last night, with many in the media and on Twitter speculating about the dark thoughts he must have been thinking. (The Washington Post)