"洗" (xǐ) in Engpsh is "wash". It comes from the verb "to wash", which means to clean something by using water and sometimes soap or another cleaning agent.
例句：
I need to wash my hands before I eat. (我需要在吃饭前洗手。)
Can you please wash the dishes after dinner? (晚饭后能请你洗盘子吗？)
He washed the car on Saturday morning. (他周六早上洗了车。)