Focus on the pronunciation of mellow
English definition of “mellow”
/ˈmel·oʊ/ v [I/T] (SOFTEN)
› to become more pleasing because of becoming more smooth, soft, or well developed and less sharp, bright, new, or rough: [I] The bright orange of the fresh paint mellowed as it dried. [T] Those medicinal herbs can be mixed with more appetizing herbs (= herbs that taste better) to mellow their flavors.