Unwanted repetition of text

See the screen shot below.

When this screen shot was taken, though you don't see my cursor, the cursor was hovering over the Highlight icon--not clicked, just hovering.

When I hover over something--anything at all--a frame appears with a light gray background that repeats the content of whatever I'm hovering over and in this case it explains the icon. You see the light gray frame in the screen shot, that reads "Text highlight color (Bright Green)."

It's not only annoying, but often obscures a large section of my window if I hover over something that is a long piece of text.

This is a new occurrence. I figured it had to do with accessibility settings, but I find nothing clicked that calls for these boxes to appear.

They appear not only in Apple apps but in MS Word (as in the present instance) and other apps as well.

How can I turn this off?