Where Does the Expression Dull as Ditchwater Come from?

The original simile, dull as ditchwater, dating from the 1700s, alluded to the muddy water in roadside ditches. In the first half of the 1900s, perhaps through mispronunciation, it became dishwater, that is, the dingy, grayish water in which dirty dishes had soaked.

What does the idiom dull as dishwater meaning?

: very boring or dull The conversation was as dull as dishwater.

What is the meaning of as dull as tombs?

Answer: Dull as a tomb could be very slow to think or understand. A person who lacks interest in doing anything or one who is lazy. Explanation: Sometime due to some unknown reason, we may wish to be idle and not want to do or actively participate in any activity we could say he or she is dull as a tomb.