Sankar suvan Kesari nandan: meaning
Chaupai 6 of the Hanuman Chalisa
संकर सुवन केसरीनंदन
तेज प्रताप महा जग बंदन
Saṅkar suvan Kesarī-nandan / tej pratāp mahā jag bandan
You are a son of Shiva and the joy of Kesari. Your radiance and might are so great that the whole world bows to you.
Words
संकर SaṅkarShivaAwadhi form of Sanskrit Śaṅkara, a name of Shiva.
सुवन suvanson
केसरीनंदन Kesarī-nandanKesari's joy (son)Kesari is Hanuman's monkey father; nandana means one who gladdens, so a son.
तेज tejradiance
प्रताप pratāpmight
महा mahāgreat
जग jagthe world
बंदन bandanbows toAwadhi form of Sanskrit vandana, respectful greeting.
Son of Shiva and son of Kesari
The verse gives Hanuman two kinds of parent. In Valmiki, Kesari is the husband of Anjana, and the Wind god is Hanuman's father. The link to Shiva comes from other traditions, where Hanuman is an aspect or incarnation of Shiva. Some printings read 'Shankar svayam' here, 'Shiva himself', instead of 'Shankar suvan', 'son of Shiva'.
Source: Valmiki Ramayana, Kishkindha Kanda, sarga 66 (Kesari and the Wind); Shiva Purana (Hanuman as a form of Shiva)