to know something inside and out ☊ 
am hiểu cặn kẽ về gì ☊ to turn inside out ☊ lộn trái ☊ even within, right inside of ☊ ngay trong ☊ a city’s inner areas, urban areas; inside a city ☊ nội thành ☊ within, inside the United States ☊ trong nội địa Hoa Kỳ ☊ on the wrong side, inside out ☊ trái cựa ☊