thee/thou
old, poetic form of you
to rue
to regret
ere
before, prior
to swerve
to deviate, to curve, to veer
to mell
to blend, to mix, to shuffle
thy
old, poetic form of your
to peruse
to examine or inspect something
treble
threefold, three times
doth
old, poetic form of does
mirth
great joy, cheerfulness