[noun] [C] [plural] jellyfish - a sea animal with a soft oval almost transparent bodySome jellyfish can give you a nasty sting.(figurative esp. US) Don't be such a jellyfish (= weak cowardly person) - go ahead and ask her to the dance.
JELLYFISH
Meaning of JELLYFISH in English
Cambridge English vocab. Кембриджский английский словарь. 2012