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dipstick

[dip-stik]
noun
  1. a rod for measuring the depth of a liquid; especially, a thin metal rod used to measure the oil level in the crankcase of an automotive engine.
  2. Slang. fool; jerk.
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Origin of dipstick

First recorded in 1925–30; dip1 + stick1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for dipstick

dipstick

noun
  1. a graduated rod or strip dipped into a container to indicate the fluid level
  2. British slang a fool
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012