What is the meaning of 一挺 in this sentence? I know 挺 can describe something as straight or erect, but I am confused why 一 is said before it.
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Well, what does a big belly do? It sticks out, protrudes!
Have a look here, definition 2. especially: 凸出
The snowman, with his big belly sticking out, playfully said, "I am winter."
(There is a German joke about big-bellied men, this just reminded me of it, but you'd have to know German to understand it: Er ist ein Spiegeleimensch.)