This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A heavy fishing line usually several miles long and having a series of baited hooks.

n. A very long fishing line carrying a series of baited hooks.

adj. Longer than usual; especially reaching to the hips.

"The leatherback is listed as critically endangered by the World Conservation Union and scientists warn that it could extinct in the next 5-30 years unless immediate action to remove threats to its survival such as longline fishing."

long line   

long-line   

bluefin    underwire    10th    klatha    gill net    unsexy    weeny    heavy-booted    000-tonne    Down East