He stayed within doors all day, devoting himself to study.
Tips
register
户牖 is classical and literary. In modern speech use 门窗 (ménchuāng) for 'doors and windows.' You will see 户牖 in old texts and architectural writing.
memory
户 = single-leaf door, 牖 = window opening with a wooden lattice. Together they form the boundary between inside and outside, hence the figurative meaning of 'home.'
