1930s; earliest use found in The Port Arthur News. From free + spooling, after free spool.
1940s; earliest use found in Berkshire County (Pittsfield, Massachusetts) Eagle. From free + spooling, present participle of spool, after free spool.
英语词典包含243303条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。