ر خ وr-kh-w
(ک) رَخُوَ يَرْخُوْ رَخَاوَةًrakhuwa yarkhū rakhāwatan: to be soft and slack.
رُخَاءٌrukhāʾ: a soft, pleasant wind, one that is not violent. Only once in the Quran, describing the wind made subservient to Sulaymān (peace be upon him): ﴿تَجْرِيْ بِاَمْرِهِۦ رُخَآءً حَيْثُ اَصَابَ﴾ (Ṣād 38:36)