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.
Slang. fool; jerk.

1925–30; dip1 + stick1

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World English Dictionary
dipstick (ˈdɪpˌstɪk)
1.  a graduated rod or strip dipped into a container to indicate the fluid level
2.  slang (Brit) a fool

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Five minutes later the little dipstick that detects white cells in the urine was turning a dark purple.
Normally, protein is not found in urine when a routine dipstick test is performed.
Usually, the health care provider checks for glucose in the urine sample using a dipstick made with a color-sensitive pad.
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