1. understood completely or got to the bottom of something
Usage: past tense of fathom
2. measured the depth of water
Usage: nautical; past tense of fathom

Examples

• She never fathomed why he left so suddenly.
• The detective finally fathomed the mystery behind the missing jewels.
• I haven’t fathomed the complexity of this math problem yet.
• The sailors fathomed the harbor before anchoring their ship.
• He fathomed her true intentions after years of friendship.
• The captain fathomed twenty feet of water near the reef.
• Scientists have never fully fathomed the depths of the ocean trench.