Meaning of dā:
dā
嗒
Onomatopoeia
(onom.) used in words that describe machine gunfire, the ticking of a clock or the clatter of horse hooves etc
Yǔdiǎn dādā de luò zài wūdǐng shàng.
雨点嗒嗒地落在屋顶上。
The raindrops pattered on the roof.
Verb
to despair
Tā tīng dào huài xiāo xī hòu gǎn dào fēi cháng shī tà.
他听到坏消息后感到非常失嗒。
He felt very despondent after hearing the bad news.