buông đũa bát đứng lên: having let down his bowl and chopsticks, he stood up
buông lỏng dây cương cho ngựa lên dốc: he let loose the bridle for his horse to go up the slope; he gave his horse the bridle for him to go up the slope
To let down, to drop
tóc buông thõng sau lưng: with hair let straight down on back
màn đêm buông xuống cánh đồng: the mantle of darkness was let down on the field
buông mình ngồi xuống ghế: to let oneself down into a chair