A feeling of considerable warmth.

ETYM Poetic.
1. To emit a steady even light without flames.
2. To be exuberant or high-spirited.
3. Said esp. of the complexion: to show a strong bright color, such as red or pink; SYN. beam, radiate, shine.
4. To experience a feeling of well-being or happiness, as from good health or an intense emotion; SYN. beam, radiate, shine.