One of the mysteries of the English language finally explained.
A remote control automatic locking system on a motor vehicle.
1980s; earliest use found in The Times. Shortened from the name of Paul Lipschutz, French inventor who designed the system in 1978.
Representing a small, abrupt, hollow sound, as of an object dropping into water, a bubble bursting softly, etc. Frequently reduplicated, or in combination with other similar sounds.
Such a small hollow sound.
Early 20th century. Imitative. Compare plop, plop, plup [interjection].
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