He placed his thumb on the white square and looked up at the screen.

He placed his thumb upon the slide of the safety catch, but it would not budge.

She started to speak, but he placed his thumb on her mouth.

Alone again, Kim placed his thumb to the seal and activated the release.

When heavy weights were balanced on the scales, the trick was to know where to place your thumb.

She bent over him, placing her thumb and fingers around his throat to feel the pulse.

He placed his thumb on the silver circle and pushed.

He placed his thumb against the tender flesh of her inner wrist.

Ben placed his right thumb on the glass oval, then did the same with his left.

Placing my thumb on the safety catch, I was ready.