JMdict: 1391360

潜入 【せんにゅう】

  1. [n,vs,vi] infiltration; sneaking in; going undercover
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
Submerge, Conceal, Hide, Lower (voice), Hush セン ひそ.む, もぐ.る, かく.れる, くぐ.る, ひそ.める
Enter, Insert ニュウ, ジュ い.る, -い.る, -い.り, い.れる, -い.れ, はい.る 1

Words often seen with this one: (experimental feature)

捜査 (20), この (18), 成功 (18), ため (15),  (13), こと (12),  (12), 調査 (11), 作戦 (11), 捜査官 (11)