Hi teachers,<br/><br/>In the following sentence 'at all' is an adverb or an idiom?<br/><br/><b>“</b>In fact, I don’t think I know anything about him <b><u>at all</u></b>.<b>”</b><br/><br/>Usage: It is used to emphasize, usually in negative or yes / no sentences.<br/><br/>Am I correct about the usage<br/><br/>Thanks in advance