The difference between Back to front and Upside down
When used as adverbs, back to front means turned so that the back is now at the front, whereas upside down means inverted, so that the top is now at the bottom.
When used as adjectives, back to front means reversed, with the back now at the front, whereas upside down means inverted.
check bellow for the other definitions of Back to front and Upside down
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Back to front as an adverb:
Turned so that the back is now at the front.
Examples:
"I was in such a hurry that I put my underpants on back to front."
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Back to front as an adjective:
Reversed, with the back now at the front.
Examples:
"The classic VW Beetle is a back to front car, with the engine at the rear."
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Upside down as an adverb:
Inverted, so that the top is now at the bottom.
Examples:
"The Union flag was flying upside down, a sign of danger."
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Upside down as an adverb:
In great disorder.
Examples:
"The thief had turned the room upside down."
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Upside down as an adjective:
Inverted; turned so that the top is at the bottom.
Examples:
"The pattern resembled an upside down letter W."
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Upside down as an adjective:
In great disorder.
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Upside down as an adjective (finance):
Owing more money for something than it is worth; having negative equity.
Examples:
"He's upside down on his mortgage."