1) Begin to blush 2) Betray embarrassment 3) Betray shame 4) Blush 5) Blush in socialist lair 6) Color 7) Colour 8) Crimson 9) Discolor 10) Discolour 11) Embarrass 12) Flush 13) Get embarrassed 14) Get visibly embarrassed 15) Glow 16) Go red 17) Look embarrassed 18) Make red 19) React to a slap 20) Show embarrassment 1) Blush 2) Dye 3) Encrimson 4) Ripen 5) Rubify 
• (v. i.) To grow or become red; to blush. • (a.) To make red or somewhat red; to give a red color to.
Red'den transitive verb [ imperfect & past participle Reddened (-d'nd); present participle & verbal noun Reddening .] [ From Red , adjective ] To make red or somewhat red; to give a red color to. Red'den intransitive verb To grow or become red; to blush. « Appius reddens at each word you speak.» Pope. « He no sooner saw that her eye glistened and her cheek reddened than his obstinacy was at once subbued.» Sir W. SCott. 
[v] - make red 2. [v] - turn red or redder