In sailing, pay out (or paying out) means to let out a line (rope) or chain gradually, slackening it out in a controlled manner. It is the opposite of hauling in or taking up the slack.

Usage: It is often used when handling anchor lines (letting out more rode), mooring lines, or adjusting sail control lines like an outhaul.

Example: "Pay out the stern line," means to slowly release the rope to let the boat move away from the dock.

Related terms: "Payed out" refers to the past tense of this action, whereas "paying the devil" is a separate, old nautical term for sealing hull seams.

Anchoring: When dropping anchor, a sailor will pay out the anchor rode (rope or chain) to ensure enough "scope" for the anchor to dig in and hold securely.

The "Bitter End": This phrase originates from paying out a line until you reach the very end—the part attached to the "bitts" (deck posts)—meaning no more line can be let out.