chalk full or chock full chuck full Originally a person or thing stuffed to the point of choking was “choke-full.” In modern speech this expression has become “chock-full,” or in less formal American English, “chuck-full.” Chalk has nothing to do with it. Facebook Twitter Google + Do you make these 10 mistakes? grill vs grille buttox vs buttocks heal vs heel flys vs flies blindsighted vs blindsided tragedy vs travesty pastorial vs pastoral swam vs swum ninty vs ninety practicle vs practical