To redden is to become red, or to make something red. A face reddens when blood comes up into the skin — from heat, from running, or from feeling shy or angry.

To redden「redden」 is就是 to become red, or to make something red變紅，或是把某樣東西弄紅。A face臉 reddens會redden（發紅） when blood comes up into the skin當血液湧上皮膚的時候 — from heat, from running, or from feeling shy or angry可能是因為熱、跑步，或因為害羞、生氣。

The sky can redden at sunset. A cloth can redden if the dye spreads.

The sky天空 can redden可以redden（變紅） at sunset在日落的時候。A cloth一塊布 can redden可以redden（變紅） if如果 the dye spreads染料暈開了。

You can redden something on purpose, though in everyday talk people more often say “make it red” or “turn red.” “Redden” feels a little more like writing or storytelling than like a word you drop in the kitchen. Though actually, for faces, “go red” and “blush” are what most people say; “redden” sits next to those, a bit more careful, and it covers the sky and the skin as well as a shy face.

You你 can redden something on purpose可以刻意把某樣東西redden, though不過 in everyday talk在日常對話裡 people人們 more often say更常說 “make it red”「make it red」 or或 “turn red”「turn red」。“Redden”「Redden」 feels a little more like寫起來感覺更像 writing or storytelling寫作或說故事的用詞 than like而不像 a word you drop in the kitchen在廚房裡隨口說的字。Though actually不過其實, for faces講到臉的時候, “go red” and “blush”「go red」和「blush」 are what most people say才是大部分人會說的; “redden”「redden」 sits next to those就緊挨在旁邊, a bit more careful用字更講究一點, and而且 it它 covers the sky and the skin as well as a shy face涵蓋了天空、皮膚，還有害羞的臉。