Blot/blɑːt/ Definition 1 of 4Pro Tip 1/3Visual Marks Blot as a noun often refers to a visible blemish caused unintentionally. Oops, a blot of paint defaced my new wallpaper. Pro Tip 2/3Often Accidental When using 'blot', it usually implies an accidental spill or spot that's undesirable. Be careful with the pen, or you'll leave a blot on the document. Pro Tip 3/3Negative Emotion 'Blot' can carry a negative connotation, suggesting annoyance or upset. He frowned at the blot marring the contract's white page.