dull and dry不是单词，单词是一个词，而dull and dry包含三个单词，故dull and dry算短语/词组。

dull and dry意为投资市场枯燥乏味;枯燥;乏味;枯燥无味，例句：Douglas has an undeserved reputation for being dull and dry 道格拉斯呆板无趣的名声并不副实。（《柯林斯高阶英汉双解学习词典》）