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Related to make hay: make hay while the sun shines
To take advantage; to make the most of an opportunity. Chicago better be careful about turnovers, or you can be sure the defending champs will make hay in those situations. We'll be able to make hay with so little traffic on the road.
make haymake good use of an opportunity while it lasts.
This is a shortened version of the proverb make hay while the sun shines , which dates from the mid 16th century.
1998 Simon Winchester The Surgeon of Crowthorne The British papers, always eager to vent editorial spleen on their transatlantic rivals, made hay with this particular aspect of the story.
To turn to one's advantage: The candidate's opponents made hay of the scandal.