厚爱 literally means 'to love dearly' or 'to cherish deeply,' and is used in formal or literary contexts. Although the POS here is verb, in everyday modern Chinese it almost always appears as a noun in polite formulas such as 承蒙厚爱 ('thanks for your great kindness'), where the speaker respectfully acknowledges the addressee's favor or affection. As a verb it is rare and may sound archaic, so learners should recognize its more common nominal usage.