Teem: to rain heavily

I know the phrasal verb "teem with sth," which means "to contain large numbers of animals or people."

The mall was teeming with shoppers last weekend.

Today, as torrential rains batter Metro Manila, I just typed the word "rain heavily" on Google, and I found out this new word, "teem." It means "to rain heavily."

Examples:

• It's been teeming down all day.
• It's teeming with rain.

Interesting! ;)