The act of making a judgment.
"The committee spent the morning judging the entries in the science fair based on their creativity and accuracy."
In plain English: Judging is when you form an opinion about someone based on what they look like or do without knowing all the facts.
"His constant judging made everyone feel uncomfortable at the party."
present participle and gerund of judge
"Judging by his nervous behavior, he must be very anxious about the upcoming interview."
In plain English: Judging means forming an opinion about someone's character based on what you see rather than knowing their true feelings.
"Don't judge a book by its cover."