The verse means,

Behold the stream swelleth, he trembleth not;

He is careless, though Jordan break forth upon his mouth.

The word "swelleth" means lit. oppresses, that is, rushes violently against him. The term "Jordan," or "a Jordan," is used by way of example, meaning a violent outbreak of water. The term "break forth" is that used of the sea, ch. Job 38:8.

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