Final answer:
The phrase 'He seemed to taste a drop of manna-dew' is a metaphor for a delightful experience.
Step-by-step explanation:
The phrase 'He seemed to taste a drop of manna-dew' is a metaphor for a delightful experience. It is not a literal description of tasting something sweet, as manna-dew is a mythical substance. The use of 'manna-dew' in the sentence creates an allusion to a heavenly or divine substance, adding to the sense of delight and pleasure expressed in the metaphor.