back.slapv.(动词)back.slapped,back.slap.ping,back.slaps v.intr.(不及物动词)To demonstrate effusive goodwill.表示热烈的良好祝愿v.tr.(及物动词)To demonstrate effusive goodwill toward (another or others).对…表示友好:对(另外一个人或其它人)表示热烈的溢于言表的良好祝愿【引伸】back.slap.pern.(名词)