redden

动词 redden:

1. turn red, as if in embarrassment or shame
   同义词：blush, crimson, flush
2. make red
3. turn red or redder

1. She reddened at the sight.
   她看到那光景而脸红。
2. The reddening sky threw into relief a line of trees on the horizon.
   通红的天空使地平线上的一行清晰可见。

red.den

v.tr.intr.（及物动词和不及物动词）
red.dened,red.den.ing,red.dens
To make or become red.
使变红，成为红