Lakes" was the name given to various cords in the past. By extension - love traps? - the knots known as "lovers' lakes" were traditionally used by sailors to propose marriage: they would send the design shown here in a sketch, WITHOUT TIGHTENING IT, to the girl of their dreams.
If the girl returned the tightly-tied lake, it evoked two intertwined hearts, as shown here. This meant that the wedding had to be prepared as soon as possible.
If, alas, the lacs came back loosened... but you get the idea.