denote a sound or sharp noise (gunfire etc)

mouth (口) + eight (八) = a sharp bursting sound

口 gives the meaning: a mouth or opening that emits sound. 八 contributes the pronunciation bā and nothing more — its sense of 'eight' or 'division' plays no semantic role here.

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The number eightPhonetic
MouthSemantic

只听的一声,子弹从耳边飞过。

zhǐ tīng bā de yī shēng , zǐ dàn cóng ěr biān fēi guò 。

there was a sharp crack, and a bullet flew past the ear.

的一声枪响,把树上的鸟都吓跑了。

bā de yī shēng qiāng xiǎng , bǎ shù shàng de niǎo dōu xià pǎo le 。

with a sharp gunshot, all the birds in the tree were startled away.

Words with 叭

高音喇叭

gāo yīn lǎ ba

tweeter

伸缩喇叭

shēn suō lǎ ba

trombone

低音喇叭

dī yīn lǎ ba

woofer

叭啦狗

bā lā gǒu

bulldog

吹喇叭

chuī lǎ ba

(lit.) blowing the trumpet

唵嘛呢叭咪吽

ǎn má ní bā mī hōng

om mani padme hum (Buddhist mantra)

喇叭

lǎ ba

horn (automobile etc)

喇叭形

lǎ ba xíng

flared; funnel-shape; trumpet-shape

喇叭水仙

lā bā shuǐ xiān

daffodil

喇叭花

lǎ ba huā

morning glory

喇叭裙

lǎ ba qún

flared skirt

喇叭裤

lǎ ba kù

flared trousers

More characters with 口