Percussing

verb

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

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

2. To impact

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

3. 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."

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

   "Percussing a patient's spleen is best done while he is on his back."