待 (dài) has two main meanings. As to stay or remain, it describes spending time at a place (在北京待三年, stay in Beijing for three years). As to treat or to deal with, it appears in 待人 (treat people) and compounds like 对待 (duì dài, to treat or handle). Note that 待 can also be read as dāi (to stay, informal and more colloquial), which overlaps with 呆 (dāi). Context and formality distinguish them.