Declan

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The Japanese word

お大事に。

is pronounced
odaizini。 | おだいじに。
means
Take care of yourself {for sick or injured person}
Examples:
お大事に。
o daiji ni.
Please take good care of yourself.
どうぞお大事に。
dōzo o daiji ni.
Please take care of yourself.
お体をお大事に。
o karada o o daiji ni.
Take care of yourself.
くれぐれもお体をお大事に。
kureguremo o karada o o daiji ni.
Please take good care of yourself.
Examples sourced from tatoeba.org