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When a boat or ship sinks after turning over its sides we say it capsized.
How did this word originate? The meaning seems little to do either with a cap or its size or tailoring a cap to a size or shape, etc.
EDIT1:
Cap is also related to Sanskrit Caphala for head,I could guess the first part. But addition of *size" got too distorted in usage I cannot understand how, seems to me too far fetched.