To my mind, the life of a lamb is no less precious than that of a human being. I should be unwilling to take the life of a lamb for the sake of the human body.
A metrical foot of two syllables, one short (or unstressed) and one long (or stressed). There are four iambs in the line "Come live/ with me/ and be/ my love," from a poem by Christopher Marlowe. (The stressed syllables are in bold.) The iamb is the reverse of the trochee.