Knees and above (i.e. shorts) according to the Mishna Berura is universal but the Shulchan Aruch doesn’t hold that way
You’re got it backwards, I believe. The M”B is meikil for under the knees, many Rishonim held even below the knees is ervah.
K-cup: ??? ???? ???? is a phrase found in Chazal :????? ?”?.
???? is mentioned in :?????? ??.