This is the 9029th most frequent Japanese word.
浮き
"浮き" means "float" or "floating object" in English.
In this case, "浮き" indicates a device used in fishing lines to signal bites and maintain the hook's position in the water.
浮きを使って魚を釣るのが楽しい。
Using floats to catch fish is fun.
Here, "浮き" refers to a floating device used for buoyancy.
彼のボートには赤い浮きが付いています。
His boat has a red float attached.
In this sentence, "浮き" conveys the idea of something being not tangible or realistic, metaphorically floating.