: a submerged marine plant (such as eelgrass)

What does it mean when someone gulps?

1 : to swallow hurriedly or greedily or in one swallow. 2 : to keep back as if by swallowing gulp down a sob.

What is the meaning invalidated?

transitive verb. : to make invalid especially : to weaken or destroy the cogency of. Other Words from invalidate Synonyms Choose the Right Synonym Example Sentences Learn More About invalidate.