Ruddying is a term that refers to giving a reddish hue, especially to the face. There are many synonyms for this word, such as blush, flush, crimson, redden, glow, etc. Blush refers to a sudden reddening of the face due to shame or embarrassment. Flush is an intense redness or glow, usually associated with excitement or anger. Crimson is a deep, dark red color. Redden means to become or make something redder in color. Glow is a soft, warm light emitted by something. All these words are used to describe the reddening of the face or any object, indicating a change in color.