Fishing supplies the language of the whole enterprise — hooks, lures, the catch, the one that got away — so these lines barely need explaining. They land best where the metaphor is visible: the tackle shop, the pier, the lake at dawn with someone who also thinks 5am is a reasonable time to be there.
Patience is the shared virtue. Anyone who fishes understands a long wait for the right bite, which is also the correct attitude to bring to using these.
Fishing flirtation rewards the same discipline as fishing: cast once, wait, and don't yank at the first nibble. The metaphor's depth is the category's gift — hooks, bait, keepers and catch-and-release give you an entire relationship arc in angling terms, and the listener can play their side of it back to you, which is how a line becomes a conversation.
Adjacent waters: sailor lines for the saltier end of the harbour, camping lines for the shore after dark, and hunting lines for the rest of the outdoors.

