Almost on the Button

My wife-- who loves to distort idioms into new phrases that often make better sense than the original-- read the weather forecast and noticed that high winds were predicted, and so she remarked "button down the hatches," and I said "it's batten, not button . . . batten down the hatches," and then we had to check exactly what a batten is: 

a batten is a long, flat strip of wood or metal, used to secure something in place . . . such as the hatch on a sailboat.