PERCUSSING

To strike; to hit; to knock; to give a blow to

"Solid bodies, if they be very softly percussed, give no sound."

To impact

"Falling on the roof of the caravan, the hailstones percussed noisily."

To attempt to divine the location or other quality of something by tapping on (an overlying surface)

"The doctor percussed his chest to determine whether he had pneumonia."