Oral intercommissural distance (mouth width) and philtrum length are useful measurements for diagnosis of wide or large mouth (macrostomia), small mouth (microstomia), long philtrum and short philtrum and form ‘good handles’ in syndromic delineation.

Use it in the bath or shower. Instead of bath oils, bubble-ups, moisturizers. Instead of a bar of soap!

So that it is best to take this meaning here, and understand, that an oath puts an end to all gainsaying by confirming the matter one way, in which all parties consent …

Anything short of that is just a lot of Bushlips.