1. A mistake made in assessing a situation, forming an opinion, or making a decision
Trusting him with the project was an error in judgment on my part.
Confiar o projeto a ele foi um erro de julgamento da minha parte.
2. A miscalculation or faulty assessment that results in a wrong conclusion or action
The coach's error in judgment cost them the championship game.
O erro de julgamento do técnico custou-lhes o jogo do campeonato.