eggshells n. + Add to list US //ˈɛɡˌʃɛɫz// UK //ˈɛɡʃɛlz// eggshells Synonyms Synonyms eggshellshe'll Idioms1 entry01walk on eggshellsTo be overly careful in dealing with a person or situation because they get angry or offended very easily; to try very hard not to upset someone or something.