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4.
jumping into the creek from a rope and yelling plummet! at the same time
1..2..3..PLUMMET! *splashhhh*
by ReneeIsMe March 21, 2006
 
1.
when a person jumps from a height of minimum 2 stories
Levi told Jeff to plummet when he broke the overhead in chem. class.
by the Chemistry kid May 06, 2004
 
2.
to fall from a high level or position
Prices have plummeted.
by English_dictionary January 05, 2013
 
3.
to fall really fast straight down
susie just plummeted off that building and is laying in a bloody mass over there
by SN August 04, 2003