dipstick
noun [ C ] uk/ˈdɪp.stɪk/ us/ˈdɪp.stɪk/
(MEASURE)
（尤指用来测量汽车发动机机油量的）油标尺，机油尺，油位计
a long, thin stick for measuring the amount of liquid in a container, especially the oil in a car engine
(PERSON)
slang傻瓜，傻帽
a silly person