They spike during the holidays

SALES

Retailers slash prices to lure shoppers during festive seasons.

This clue plays on the double meaning of "spike"—it can refer to a sudden increase or a sharp point. During the holidays, retail "sales" surge dramatically, which fits the idea of something spiking. The word "sales" itself also sounds like "sails," but that’s not the focus here; the key is the seasonal shopping rush. It’s a straightforward definition with a slight twist on the word "spike" to make it more engaging.