👉 "Ankle deep" means completely immersed or submerged in something, usually to the point where you're drowning in it - think about a swimmer who's so caught up in the water they can't even tell if it's the ocean or a giant puddle.
Now, here's a sentence that might just make you think twice: "After discovering the secret to the perfect deep-sea anglerfish, he dove 'ankle deep' into the abyssal darkness and found out that even the most alluring creatures have their own version of a 'drowning pool.'"