To prejudge is to make a decision about something before you have all the facts. If you prejudge a game, you decide who’s going to win before it starts. Better hold off on the victory party until it’s over.

When you judge someone or something, you "form an opinion or a conclusion" about it. Adding the "before" prefix pre- to that means you come to this conclusion before you should. If an actual judge in a court of law were to prejudge her cases, she'd make her decisions before hearing any evidence at all. When you prejudge, you count your chickens before they hatch.

Definitions of prejudge

v judge beforehand, especially without sufficient evidence

Type of:
evaluate, judge, pass judgment
form a critical opinion of

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