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I read in a manga awhile back (Kobo chan I believe) that there is a saying that says sth like "Children grow up while watching their parents' back" like your parents is the one walking before you so you only see their back, and by seeing their back you witness their hard work in order to raise you.
Going from that thought, the back phrase extended into people who protects you or people in general. Sometimes someone can look so unreliable from the outside (small back or weak stature) but inside they're carrying a heavy burden on their back.
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