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a. any catch on a mechanism that acts as a switch
b. (as modifier): trip button
2. a surge in the conditions of a chemical or other automatic process resulting in an instability
3. Informal a hallucinogenic drug experience
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
To release a lever or set free a mechanism.
The line of cars hauled by mules or by motor, or run on a slope, plane, or sprag road.
An automatic arrangement for dumping cars.
Part of the mechanism of some firearms, released by the action of the trigger.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.