Fall off and Wasting away

Fall off verb - To turn away from a straight line or course.

Wasting away and fall off are semantically related In some cases you can replace term "Wasting away" with "Fall off", this phrasal verbs are similar.

Wasting away noun - A decrease in size of an organ caused by disease or disuse.

Fall off and wasting away are semantically related in become smaller topic. Sometimes you can use "Fall off" instead a verb "Wasting away".