doormat

Don't Sweat the Small Stuff…を読んでいます。
Just for Fun, Agree with Criticism Directed Toward Youの章に出てきた単語です。
An incredibly useful exercise is to agree with criticism directed toward you. I'm not talking about turning into a doormat or ruining you self-esteem by believing all negativity that comes in your direction.
ここでの "doormat" 意味は何を言われても、されてもドアマットの様に何も逆らわない人の事を指していることは容易に分かりますが、この比喩的な意味が著者の比喩か一般的なものか、辞書で確認します。
・Oxford English Dictionary: A submissive person who allows others to dominate them: to put up with such treatment you must be either a saint or a doormat
・Cambridge English Dictionary: a person who accepts being treated badly and does not complain: He may be selfish and insensitive, but she is a doormat.
一般的に使われることが確認できました。