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The Collaborative International Dictionary
Percussing

Percuss \Per*cuss"\, v. t. [imp. & p. p. Percussed; p. pr. & vb. n. Percussing.] [L. percussus, p. p. of percutere; per + quatere to shake, strike. See Quash.] To strike smartly; to strike upon or against; as, to percuss the chest in medical examination.

Flame percussed by air giveth a noise.
--Bacon.

Wiktionary
percussing

vb. (present participle of percuss English)