- either of a pair of landmarks or marks on a mariner's chart lying upon a line (clearing line) along which a vessel can sail to avoid navigational hazards.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for clearing-line
Historical Examples of clearing-line
The clearing-line is made of several yards of strong small cord, to the end of which is fastened a heavy ring of lead or brass.