As vinegar to the teeth— "A negligent dilatory servant vexes and rives, as it were, with trouble those who send him; just as keen vinegar gives pain to the teeth, and bitter smoke vexes and torments the eyes." See Schultens.
Related Commentaries of Proverbs 10:26
Proverbs 10:26
26 As vinegar to the teeth, and as smoke to the eyes, so is the sluggard to them that send him.