Fall away and Fall down

Fall away verb - To grow less in scope or intensity especially gradually.

Fall down and fall away are semantically related in fall topic. In some cases you can use "Fall down" instead a verb "Fall away", when it comes to topics like fell.

Fall down verb - Lose an upright position suddenly.

Fall away and fall down are semantically related in fall topic. Sometimes you can use "Fall away" instead a verb "Fall down", if it concerns topics such as fell.