a metallic tapping sound

A light tap or slap, especially with the hands, patent, a light touch or stroke, adjective_ having only superficial plausibility, exactly suited to the occasion, trite, being superficially complete, lacking originality, verb_ To hit lightly and repeatedly with the flat of the hand to make smooth or flat, To gently rain, To (gently) tap the flat of one's hand on a person or thing, intransitive verb_ To run or walk with a tapping sound, To mold by tapping gently with the hands or a flat implement, To hit something or against something gently or lightly, adverb_ Readily or perfectly as a result of memorization or familiarization, opportunely, in a timely or suitable way, Perfectly, adjective_ trite, being superficially complete, lacking originality, timely, suitable, apt, opportune, ready for the occasion; especially of things spoken, Fitting or satisfactory in a superficial or contrived way, especially in being trite or glib

the sound of light blow or knock