1. (

• blush ,
• crimson ,
• flush ,
• redden

) turn red, as if in embarrassment or shame; "The girl blushed when a young man whistled as she walked by" ;

2. (

• redden ,

) make red; "The setting sun reddened the sky" ;

3. (

• redden

) turn red or redder; "The sky reddened" ;