Final answer:
Penelope uses the strategy of weaving a burial shroud for her father-in-law, Laertes, and unraveling it every night to delay her marriage and hold off her suitors until Odysseus returns.
Step-by-step explanation:
Penelope's strategy to hold off her suitors until Odysseus returns is to weave a burial shroud for her father-in-law, Laertes, and promise to choose a suitor after she has completed the shroud.
However, she unravels her weaving every night to delay the completion.
This strategy effectively postpones her marriage and keeps the suitors at bay.