Regarding metaphysical poetry: I need to define and exemplify "conceit", "telescoping" and "juxtaposition"

Here's an example for a conceit (an extended metaphor)
from the poem, "The Flea" by John Donne in which a flea that bites both the speaker and
his lover becomes a conceit arguing that his lover has no reason to deny him sexually,
although they are not married:

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Oh stay! three lives in one flea
spare
Where we almost, yea more than married are.
   This flea is
you and I, and this
Our marriage-bed and marriage-temple
is.