Juliet:
'Tis almost morning, I would have thee gone—
And yet no farther than a wanton's bird,
wanton=immodest woman
That lets it hop a little from his hand,
Like a poor prisoner in his twisted gyves,
gyves=shackles
And with a silken thread plucks it back again,
So loving-jealous of his liberty.
loving-jealous=jealous out of love

Romeo:
I would I were thy bird.
would=wish

Juliet:
Sweet, so would I,
Yet I should kill thee with much cherishing.
should=would
much=too much
Good night, good night! Parting is such sweet sorrow
That I shall say good night till it be morrow.
shall say good night=shall say good night again and again


Preceding this passage is this passage:

Juliet:
A thousand times good night!

Romeo:
A thousand times the worse, to want thy light.
want=be without
Love goes toward love as schoolboys from their books,
from=leaving from - eagerly
But love from love, toward school with heavy looks.
from=leaving from - unwillingly
toward school=as schoolboys toward school