One of the mysteries of the English language finally explained.
1‘the roof of our house fell in’
collapse, cave in, come down about one's ears, crash in, fall down
subside, sag, slump, sink inwards
give way, crumple, crumble, disintegrate, fall to pieces
2‘he ordered his troops to fall in’
get in formation, get in line, line up, take one's position, get in order, get into columns, get into rows
British informal form a crocodile
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