Carry, Bear
You use your fingers at dawn to carry many things. You have to carry yourself out of bed. You have to carry your backpack or purse or laptop bag to school or work. Your fingers have to carry a lot of weight around at dawn.
Think about your morning routine. You carry yourself into the bathroom and carry a toothbrush into your mouth. You carry your coat and bag out the door.
たん
にな, かつ
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Once you're carrying everything, and the dawn sun is shining bright, you start getting tan (たん). Especially those fingers you're using to carry things.
Picture yourself carrying a coat and a bag, walking through the rice fields to work, with the hot, dawn sun shining down, making your fingers get tanner and tanner.