Vocabulary
Form
to shut oneself in (one's house, room, etc.); to confine oneself (to)
verb
vi
Example sentences
心配（しんぱい）になって見に行（みにい）くと、彼（かれ）はデパートのトイレに立（トイレにた）てこもって出（で）てこない様子（ようす）でした。
When I got worried and went to check on him, it looked like he'd barricaded himself in the department's toilet and wasn't coming out.
しかし王女（おうじょ）は部屋（へや）に立（た）てこもって出（で）てこなかった。
However, the princess had barricaded herself in her room and wouldn't come out.