What does reddening mean?
“Reddening” describes a gradual or noticeable change toward red. It can be used for physical effects, such as skin becoming red from heat, cold, exertion, or embarrassment, and for natural changes, such as a sky or autumn leaves turning red. The word may describe an intransitive process (“her cheeks were reddening”) or a transitive action (“the light reddened the water”), though the latter is less common in everyday usage. As an adjective, “reddening” is especially natural before nouns such as “sky,” “sun,” or “horizon,” while as a noun it refers to the process itself. Its connotations are generally vivid and slightly descriptive, making it more evocative than the plainer “turning red.” The word derives from “red,” an ancient English color term with Germanic and Indo-European relatives.
To become red, especially because of heat, emotion, exertion, or changing light.
"The horizon was reddening as evening approached."
Often used in the present participle form before a noun, as in “a reddening sky.”
Turning or becoming red.
"A reddening glow spread across the clouds."
This use is common in descriptive writing, particularly for skies, light, skin, and vegetation.
The process or act of becoming red.
"The reddening of the sea reflected the sunset."
More common in literary or descriptive contexts than in everyday speech.
The plural is uncommon but follows the regular English rule for nouns.
"The successive reddenings of the sky marked the changing light."
Reddening captures the moment when a color intensifies: the cheeks, sky, or horizon shifts toward red.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does reddening come from?
The form comes from the English verb “redden,” which is formed from “red” plus the suffix “-en.” “Red” descends from Old English “reod,” a Germanic color word related to forms such as German “rot” and Dutch “rood,” and ultimately to an Indo-European root associated with the color red. The suffix “-en” has long been used in English to form verbs indicating a change of state, as in “darken,” “soften,” and “strengthen.” “Redden” developed the meaning of becoming red and, by extension, making something red; “reddening” is its present participle and gerund form.
Related word forms
How reddening is actually used
The form is commonly used as the present participle of “redden,” especially before a noun, as in “a reddening sky.” In formal writing, the base verb “redden” may sound more natural when the action is stated directly.
Easily confused with reddening
“Reddening” is the present participle of the verb “redden,” while “redden” is the base form used in dictionaries and in structures such as “to redden.”