Sheltering indoors: going inside and staying in a safe part of a building to protect oneself (e.g., during tsunami warnings, flying debris, or storms).
自治体からの指示で屋内退避を行い、窓から離れて中に入りました。
Following the local authority's instruction, we sheltered indoors and moved away from the windows.
学校では、地震のときはまず机の下に隠し、その後屋内退避を指示されることがある。
At school, during an earthquake you first hide under a desk, and later you may be instructed to shelter indoors.
津波警報が出た場合、低地の人は高台へ避難するが、内陸や頑丈な建物がある場合は屋内退避が案内されることもある。
When a tsunami warning is issued, people in low-lying areas evacuate to higher ground, but if inland or in sturdy buildings, instructions to shelter indoors may be given.