'Dǎ sǎn' literally combines 打 (dǎ), meaning 'to do, to perform, or to handle', and 伞 (sǎn), meaning 'umbrella'. Though 打 has many meanings, here it functions as a verb prefix indicating the act of using or handling an object — similar to how 打电话 (dǎ diànhuà) means 'to make a phone call'. So 打伞 specifically means 'to hold up an umbrella' or 'to use an umbrella for protection from rain or sun.'

This phrase is commonly used in everyday spoken and written Chinese, especially during rainy or sunny weather. It implies active use — not just carrying an umbrella, but holding it overhead to shield oneself. You’ll hear it in weather reports, travel tips, and casual conversation: e.g., when advising someone to stay dry or avoid sunburn. It’s neutral in register and appropriate for all ages and contexts.