n. 砰(子弹击中时的声音), 报时的最后一声, 声脉冲

vi. 砰(铛)地发声

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Ping \Ping\, n. [Probably of imitative origin.]
The sound made by a bullet in striking a solid object or in
passing through the air.


Ping \Ping\, v. i. [imp. & p. p. {Pinged}; p. pr. & vb. n.
{Pinging}.]
To make the sound called ping.

backfire \backfire\, back fire \back fire\
1. A fire started ahead of a forest or prairie fire to burn
only against the wind, so that when the two fires meet
both must go out for lack of fuel.
[Webster 1913 Suppl.]

2.
(a) A premature explosion in the cylinder of a gas or oil
engine during the exhaust or the compression stroke,
tending to drive the piston in a direction reverse to
that in which it should travel; also called a {knock}
or {ping}.
(b) an explosion in the exhaust passages of an internal
combustion engine.
[Webster 1913 Suppl. +PJC]