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sunburn; suntan; tan
becoming discolored from the sun (e.g. of paper); yellowing
drying up (of a river, field, etc.)
夏の海辺で日やけして肌が真っ赤になった。
I got sunburned at the beach in summer and my skin turned bright red.
古い本の表紙が日やけで変色していた。
The cover of the old book had discolored from sun exposure.
日やけ止めを塗らずに外出して後悔した。
I regretted going out without applying sunscreen.