Definition
to elucidate something with clarity and detail
详细解释；清楚说明
During the meeting, she spelled out the company's new policy.
在会议中，她详细说明了公司的新政策。
To help the students grasp the topic, the teacher spelled the concepts out one by one.
为了帮助学生理解主题，老师逐一向他们解释了这些概念。
He needs to spell out every detail of the budget to get the approval.
他需要详细说明预算的每一个细节才能获得批准。