This is the 2715th most frequent Chinese word.
偷
"偷" means "to steal" in English.
Here, "偷偷地" modifies the verb "smile," implying that the action is done privately or without drawing attention.
他总是偷偷地笑，谁也没发现。
He always smiles secretly, and no one notices.
The word "偷" here means 'to steal' and indicates the action of taking something without permission, often illegally.
他偷了一辆车。
He stole a car.
In this context, "偷" is used as part of "偷偷地," which means 'secretly' or 'stealthily.' It indicates discretion or doing something covertly.