ビールの泡がきれいだ。
The head on the beer is beautiful.
手を洗うときは、石けんをよく泡立ててください。
When washing your hands, please lather the soap well.
子どもがシャボン玉の泡を追いかけている。
The child is chasing soap bubbles.
The dog had collapsed and was foaming at the mouth.
After a while, the foam disappeared.
I put in too much detergent and the sink got covered in suds.
a blow; a shock
beat; whip; whisk; lather
Kana spelling is common in everyday writing, especially when the kanji is not needed.
Uncommon variant; learners should use 泡.