On is short for upon. It means row after row (after row after row). Lots of rows. In the poem "Flanders Fields" in means the rows of grave markers for the thousands of soldiers buried there- in rows.

I don't know Margo.

The short key to hide a row in MS Excel is Ctrl key and the number nine. The short key to hide a column is Ctrl key and the number zero. You first need to click on a cell in the column or row that you want to hide.

10

No. There is no short vowel sound. The first O has a long O sound, the second is a schwa (row-butt).