Sag and Sinkage

Sag noun - The extent to which something hangs or dips below a straight line.

Sinkage and sag are semantically related in drop topic. In some cases you can use "Sinkage" instead a noun "Sag".

Sag and sinkage are semantically related in depression topic. You can use "Sag" instead a noun "Sinkage", if it concerns topics such as lowering, concavity, empty or dented area.