I know hundreds of people who have spent years and thousands of dollars on tests looking for ulcers or spastic bowels. I tell them to lay off all dairy products for two weeks. The results are usually so striking that it changes their lives.
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.