Decline

падение

padenije

(downward movement, fall)

склон

sklon

(sloping downward)

сниже́ние

snižénije

(reduction or diminution of activity, prevalence or quantity)

спад

spad

(reduction or diminution of activity, prevalence or quantity)

спуск

spusk

(sloping downward)

упа́док

upádok

(deterioration of condition; weakening or worsening)

ослабевать

oslabevatʹ

(become weaker or worse)

отказать

otkazatʹ

(refuse)

склоня́ть

sklonjátʹ

(inflect)

спада́ть

spadátʹ

(move downwards)