Idiom Definition:
  
    
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"to have a ball"  
    to enjoy yourself very much
    to have a lot of fun
     
Synonyms:
amusement, boisterous, celebrate, celebration, cheer, delight, enjoy, excitement, feast, festive, festivity, frivolity, frolic, fun, joy, jubilate, laugh, laughs, lively, merry, merriment, mirth, party, play, pleasure, relish, revel, stimulate, stimulation, thrill
 
 
These children are 
having a ball. - - - - ->  
