氣灌進去，變大
這一組停在「變大」這一步，還沒到爆開。東西被撐開了，但撐得住，所以你得到一個可以用的大東西。
noun · B2
A photograph, or one part of a photograph, that has been printed or shown much larger than the original.
放大的照片
核心畫面
You can think of a blow-up as whatever happens when air is pushed into something. Air goes in, and the thing swells: a flat sheet of plastic becomes a bed you can sleep on, a small photograph becomes a picture that fills a wall. Keep pushing, and the same swelling turns into bursting: a pipe lets go, a quiet office row finally breaks open in front of everyone. One picture, two endings — bigger, or burst.
「blow-up」可以想成「把氣灌進去」之後發生的事。氣一灌，東西就鼓起來、撐大。扁扁一片塑膠變成可以睡的床。小小一…更多收起
「blow-up」可以想成「把氣灌進去」之後發生的事。氣一灌，東西就鼓起來、撐大。扁扁一片塑膠變成可以睡的床。小小一張照片撐成一整面牆的圖。但氣要是一直灌下去，撐大就變成撐破。管線爆開是這樣。辦公室悶了好幾週的不滿，在會議上當場翻臉，也是這樣。同一個畫面，兩種結局：變大，或是炸開。From the word’s history
Wiktionary records the noun and the adjective as deverbal from the phrasal verb blow up — blow (send air out) plus up (upward, bigger). The air-into-something picture is therefore already sitting inside the form of the word.
Wiktionary 把這個名詞和形容詞都記為從動詞片語 blow up 來的（deverbal from blow up）。blow 是送氣、吹，up 是往上、變大。也就是說，「氣灌進去、東西變大」這個畫面，本來就在這個字的組成裡。
Wiktionary entry 'blow-up' (etymology_text: Deverbal from blow up; kaikki:3f6f69a190036ae4:849030684 / 849033407)
Two branches
氣灌太多，撐破
同樣是氣一直灌，只是這一組灌過頭了。壓力累積到撐不住，當場炸開。所以這裡的重點永遠是「突然」跟「藏不住了」。
noun · B2
A sudden angry argument between people, often coming after bad feeling has been building up quietly for some time. Mainly American English.
爆發的爭吵