downgoing

down +‎ going

downgoing (not comparable)

1. (sciences, especially of a wave) Tending downward
   • 1997, Research Required to Support Comprehensive Nuclear Test Ban Treaty‎, →ISBN, page 27:

     First, explosions in the water are efficient generators of seismic waves, because hydroacoustic energy efficiently generates downgoing seismic waves below the water.

• upgoing

downgoing (plural downgoings)

1. (rare, poetic) A descent
   • 1854, John Stanyan Bigg, Night and the Soul: A Dramatic Poem‎, page 121:

     Art thou not weary, Time, of thy long tramp, / Thy long downgoings from the thrones of bliss ?

• downgone
• upgoing

• going down