His figure gradually faded into the indistinct sea of people.
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Literary / poetic. 杳 (yǎo, dim, far away) carries 日 (sun) under 木 (tree) - sun setting beyond trees, fading from view. Pairs with 渺 (miǎo, vast, tiny in the distance, with 氵 water radical) for a 'fading-into-distance' compound.
