One way to hold this word: gas trapped in a closed space, pushing upward, until it finds the opening and comes out with a short noise. The word is that noise — it was made out of the sound. From there English asks only one question: did the gas come out by itself, or did somebody help it out?
可以想成一團被關住的氣，往上頂，最後找到出口，「啵」的一聲跑出來。這個字本身就是那個聲音——它是照聲音造出來的，所以短、重、一個音節。剩下的用法只差在一個地方：那口氣是自己跑出來的，還是有人幫它跑出來的。自己跑出來，是打嗝；有人幫忙，受詞就出現了——可能是寶寶，也可能是一個發酵中的罐子。
From the word’s history
Recorded as originally American English and of imitative origin: the word was made out of the sound itself, which is why the noun and the verb are the same short syllable.
來源記錄說它出自美式英文，而且是擬聲字：這個字就是照那個聲音造出來的，所以名詞和動詞同形，都是一個短音節。
Wiktionary entry for 'burp' (etymology_text: 'Originally from American English, of imitative origin.'), supplied in this packet
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