dainty > delightful, comely
6 While the proud bird, ruffing his feathers wide,
ruffing > ruffling (as the male swan does in display) wide > wide; widely
7 And brushing his fair breast, did her invade;
brushing > brushing, rubbing (with his bill: another accurate observation from nature) invade > enter (SUS); hence: possess
8 She slept, yet 'twixt her eyelids closely spied
closely > secretly
9 How towards her he rushed, and smiled at his pride.
pride > stateliness, splendour; sexual excitement
311.33