convulsion

From Wiktionary

Pronunciation[change]

Noun[change]

Singular
convulsion

Plural
convulsions

  1. A convulsion is when someone's muscles contract very hard without the person wanting it.
    Ow, my arm is having a convulsion! It's so tense and I can't relax it!
  2. A convulsion is when there is a lot of turmoil--if nobody knows what is happening and people are afraid it is a convulsion.
    Earthquakes can cause convulsions because they are so terrifying.