Definition
Currently in the process of addressing a task or resolving an issue.
马上
"This report needs to be finished as soon as possible." "I'm on it."
「这份报告需要尽快完成。」「我正在处理。」
"We need to order some office supplies." "I'm on it."
「我们需要订购一些办公用品。」「我正在处理。」
"The client complained that the website is having an error." "Don't worry, I'm on it."
「客户抱怨网站出现错误。」「别担心，我正在处理。」