半bun3瓶ping4水seoi2響hoeng2叮ding1噹dong1

simp半瓶水响叮当

bun3 ping4 seoi2 hoeng2 ding1 dong1bàn píng shuǐ xiǎng dīng dāng

English

lit. if you tap a half-empty bottle it makes a sound (idiom)
fig. empty vessels make the most noise
one who has a little knowledge likes to show off, but one who is truly knowledgeable is modest

Sources: cc-cedict, rime-cantonese

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