英文解释:
To speak in an insultingly condescending manner to one

中文解释:
居高临下地和…说话

例子:
It is unwise for a lecturer to talk down to his audience.
演说者自觉高人一等地向听众发表不演讲是不明智的。

个人理解:
talk to 就是对某人说话,而down表示向下说,故而 talk down to 表示居高临下地和某人说话。

联想单词:
可以联想到这三个单词:condescending有优越感的 ,insulting侮辱的, belittling轻视的