浪 means "wave" and refers to waves in water, such as ocean waves. It appears in common compounds like 海浪 (ocean wave) and 冲浪 (surfing, literally "rush waves"). It can also be used figuratively to describe something wild or unrestrained.
今天海边的浪很大,不适合游泳。
Jīntiān hǎibiān de làng hěn dà, bù shìhé yóuyǒng.
The waves at the beach are big today; it's not suitable for swimming.
一个大浪打过来,把沙堡冲走了。
Yī ge dà làng dǎ guòlái, bǎ shābǎo chōng zǒu le.
A big wave came and washed away the sandcastle.
他每个周末都去海边冲浪。
Tā měi ge zhōumò dōu qù hǎibiān chōnglàng.
He goes surfing at the beach every weekend.