To stay indoors or confine oneself at home for long periods, avoiding going out or social interaction. Can refer to social withdrawal (see 'hikikomori').
彼は大学を辞めてから半年間引きこもっている。
He has been staying indoors for six months since quitting university.
雨の日は外に出たくなくて引きこもることが多い。
On rainy days I often don't want to go out and end up staying inside.
長期の引きこもりから復帰するには周囲の理解と支援が必要だ。
To recover from long-term social withdrawal, understanding and support from those around you are necessary.
軽い風邪のときは数日引きこもって安静にすることがある。
When I have a mild cold I sometimes stay indoors for a few days to rest.