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the question is settled.

Thanks for the detailed options of this word, but none of them conveys the meaning I am looking for - to make the body resistant to the sickness by regularly exposing it to changes of temperatures,...

hi, everyone,

is there any equivalent to the russian word "закаляться" (холодной водой) in English?
the closest I found was "harden", but that is more about spirit, right?

any clue?