What does "knock through" mean in this context? I searched it in the Cambridge dictionary, and it says it refers to making a whole in a wall between two rooms or demolishing that wall entirely. I can't imagine a sane person demoloishing the floor of his house for any reason so it must mean something else, mustn't it
According to popular rumour, it all started with some disappearing chickens. In 1963, a man was knocking through the basement of his home when his poultry kept going missing. He soon found they were disappearing into a hole he'd accidentally opened up, and after clearing the way, he followed them in.