(idiom) Lit. to strike a bell with a grass stalk. It describes a futile effort where one overestimates their own ability or a situation where a student's knowledge is too shallow to elicit a response from a master. Often paired with 以蠡测海 yǐ​lí​cè​hǎi and 以管窥天 yǐ​guǎn​kuī​tiān.