godan verb (-mu), intransitive verb
sneak in; creep in; steal in
Describes entering a place quietly and secretly, often without permission.
泥棒が窓から忍び込んだ。
A burglar sneaked in through the window.
彼は夜中に家に忍び込んだ。
He crept into the house in the middle of the night.
Standard kanji spelling.
Search-only kanji form; not a standard spelling.
Search-only kanji form; not a standard spelling.
Compound of 忍び (stealth, from verb 忍ぶ) + 込む (to go into).