Drop off and Die down

Drop off verb - To grow less in scope or intensity especially gradually.

Die down and drop off are semantically related In some cases you can use "Die down" instead a verb "Drop off".

Die down verb - Suffer from a disease that kills shoots.

Drop off and die down are semantically related in abate topic. Sometimes you can use "Drop off" instead a verb "Die down", if it concerns topics such as decrease, grow less or make less.