The Seizing Bend. When two lines are too dissimilar for a sheet bend to be relied on, use a seizing bend instead. It is ideal when using a lightweight throwing line as the messenger to haul a heavier working rope into position. It is a strong and secure bend that, having been subjected to all kinds of use, or misuse, can be easily untied.
Seizings are a class of knots used to semi-permanently bind together two ropes, two parts of the same rope, or rope and another object.
Akin to lashings, they use string or small-stuff to produce friction and leverage to immobilize larger ropes. Seizings are not recommended for heavy loads.