我差点儿没摔掉... I was within an inch of dropping sth,bla bla bla ... "差点儿"就是"差一点儿"， 差点儿=within an inch of 按北京话说，差点儿没摔掉（没摔掉）＝差点儿摔掉了（没摔掉） According to Pekinese dialect,the meaning of "差点儿没摔掉" is just same as "差点儿摔掉了"。 Funny right? So the meaning of the sentence of "我差点儿没摔掉...",here I give you a example and you are supposed to understand it well. 例句：我差点儿没摔掉我的iphone Example: I was within an inch of dropping my iphone to the ground.(As matter of fact the iphone was not dropped down luckily.)

差点儿:almost i come from china.add my skype id:"shelvinglee" to learn mandarin.

”我差点儿没“ , as other friends said , means " I almost ... " "摔掉“不是一个很规范的词，应该是在特定的语言环境下才用的。比如你已经站某一个东西上，才存在掉的可能性。但即使是这样，还不如说”我差点没摔下来“更符合语言习惯。 通常情况下，人在平地上，说”摔倒“。 另外顺便提一下，”差点儿没“在这里是有意义的，表示原本事情发生的可能性更大。所以原句比”我没摔倒“的语气更名。in short, almost .

就是我没摔的意思,所有"差点儿没"都有这个概念

应该是”我差点儿没摔倒“，这句话和”我差点儿摔倒“的意思是一样的，都是' I almost falled down’。