Hi, An informal and usually unimportant remark, often made in the course of doing something else (eg leaving, in this case). ie The officer said something casually as he was leaving. Clive
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dilay1985 the officer left him with a casual aside to stay safe. “Stay safe?” Mr. Delgado said. “After he just did all that?”In addition to Clive's explanation, I'd say that an "aside" is something off the main topic, something unnecessary.