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The Japanese word

達者

is pronounced
tassha | たっしゃ
means
in good health
Examples:
彼女はフランス語が達者だ。
kanojo wa furansugo ga tassha da.
She has a good command of French.
彼は水泳が達者でテニスもうまい。
kare wa suiei ga tassha de tenisu mo umai.
He is a good swimmer and also plays tennis well.
祖父は80を越えていますが、足はいたって達者です。
sofu wa hachi zero o koe te i masu ga, ashi wa itatte tassha desu.
My grandfather is over eighty years old, but he is a good walker.
Examples sourced from tatoeba.org