The word 淹没 (yānmò) is a compound verb formed through the common Chinese morphological process of combining two synonymous or semantically related characters to create a more specific or emphatic meaning. Here, 淹 (yān) means "to flood" or "to submerge", and 没 (mò) means "to sink" or "to disappear". When paired, they reinforce each other to vividly describe the action of something being completely covered and engulfed by water (or metaphorically, by something else like sound or emotion), with the second character 没 emphasizing the result of being submerged and rendered invisible or inaudible. This structure follows the common "verb + resultative complement" pattern in Chinese, where the first character denotes the action and the second describes its outcome.