Word Of The Day

There are certain expressions I've never understood. 'There are plenty more fish in the sea' comes to mind.

I don't get it. You go through a breakup with someone, and you're going to go scuba diving for company?

'Hey, Bob, check out that anglerfish. Scope out the illicium she's packing'.

What do fish say when they break up? 'There are plenty more shoppers at the mall'?