Page "Germanic substrate hypothesis" Paragraph 3

Germanic has some words which seem to ignore Grimm's law: * ūp = " up ": compare Sanskrit upa-and ( Vedic ) upári ; " help " and Vedic kḷp-= " be adapted ".

Where Proto-Germanic shows a " p " the typical PIE reflex is " b ", however Sanskrit also shows a " p ", seemingly indicating that the PIE form also included a " p ".

However, if this is true, then the Germanic reflex should be! ūf instead of * ūp ( Note, German auf contains " f " as a result of the much later High German consonant shift in which High German p became f under certain conditions.

Thus, both auf and * ūp go back to a previous form containing p ).