RALPH: Hamlet is saying here that Gertrude's behavior plucks the soul from the body of "contraction". In a marriage, two bodies are said to contract, or come together, to form a single body. What Gertrude has done, according to Hamlet, has taken the soul out of that body.

SARAH: There's also a pun here on the word "contraction." The body of contraction can also refer to the terms of a contract. So Gertrude's actions have removed the soul, or the essence, from the terms of the marriage contract.

RALPH: Likewise, she's turned the sweet religious wedding vows into a confused mixture of meaningless words.