Roll in the hay is an idiom that refers to a playful or romantic encounter between two people. It is derived from the phrase 'rolling around in the hay, ' which was used to describe the activity of animals in a barn. The two crossword solutions, BALE and ROMP, are both related to this phrase. BALE is a bundle of hay, while ROMP is a verb meaning to play or frolic in a lively manner. Together, these two words can be used to describe the activity of roll in the hay.