The antonyms for the word "blew down" would be "stood up" or "remained intact". These antonyms suggest that something did not fall or collapse due to wind or other destructive forces. Instead, it remained strong and sturdy, able to withstand the elements. Another possible antonym could be "constructed" or "built up", indicating that something was put together deliberately and with care to avoid collapse. These antonyms remind us that stability and durability are important qualities to strive for, and that careful planning and construction can help ensure our buildings and structures stand the test of time.