Definition of if he or she etc. is a day in English:

if he (or she etc.) is a day

At least (appended to a statement about a person’s age): he must be seventy if he’s a day
More example sentences
  • She is 80 if she is a day, but what she lacks in manoeuvrability she makes up for in enthusiasm.
  • Isabella is 70 if she is a day, stands about 4 foot 5 and is almost as broad as she is tall.
  • He is fifty years old if he is a day; his hair is all gone in front, and he has the complexion of a lobster.
See parent entry: day

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Pronunciation: ʌɪˈkɒnəklaz(ə)m
noun
attacking or rejecting cherished beliefs or established values...