Meaning of いっしんふらん in Japanese
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いっしん
ふらん
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Definition of いっしんふらん
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(adj-na, n) wholeheartedly; with heart and soul; intently; with undivided attention; with intense concentration; single-mindedly
自分の仕事に一心不乱に打ち込みなさい。
Give yourself to your work with body and soul.