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
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

Words often seen with this one: (experimental feature)

捜査 (18), この (16), ため (14),  (12), 成功 (11),  (11), こと (10)