huí xìn
v. reply, write back
You can also
Simplified stroke orders are based on the 'Standard of National Commonly-used Mandarin Chinese Characters (现代汉语通用字笔顺规范)', issued by the China National Language and Character Working Committee (国家语言文字工作委员会) on April 7th 1997. Traditional stroke orders are based on information issued by the Taiwan Ministry of Education.
EXAMPLES
jí shí huí xìn
phr. reply without delay
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nǐ jì rán jì de , jiù yīng gāi géi wǒ huí xìn
phr. Since you remember it, you should write back to me.