Meaning of SLUMP in English
[slump] vi [prob. of Scand origin; akin to Norw slumpa to fall] (ca. 1677) 1 a: to fall or sink suddenly b: to drop or slide down suddenly: collapse "~ed to the floor"
2: to assume a drooping posture or carriage: slouch
3: to go into a slump "sales ~ed"
slump n (1887) 1 a: a marked or sustained decline esp. in economic activity or prices "a post-election ~" b: a period of poor or losing play by a team or individual "one spring I was in a batting ~ --Ted Williams"
2: a downward slide of a mass of rock or land
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012