What is slang for missing the water on a rowing boat?

Slang for missing the water on a rowing boat is often referred to as "catching a crab." This term describes a situation where the oar hits the water at an incorrect angle, causing it to get stuck or flip up, disrupting the rower's stroke and potentially leading to a loss of balance. It’s a common mishap in rowing that can lead to a comedic or frustrating moment on the water.