JMdict: 2419360

念には念を入れる 【ねんにはねんをいれる】

  1. [exp,v1] to be extremely cautious; to be as sure as sure can be; to make assurance doubly sure
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
Wish, Sense, Idea, Thought, Feeling, Desire, Attention ネン 4
Enter, Insert ニュウ, ジュ い.る, -い.る, -い.り, い.れる, -い.れ, はい.る 1