What it means
A warning to keep your mouth shut when something needs staying quiet. If you blab, gossip, or let one detail slip, you can wreck the whole thing. It started as a WWII slogan in the US about careless talk putting ships and lives at risk. Now people use it for anything secret, from work drama to surprise plans.
Usage examples
"Don’t stick the birthday surprise in the family group chat, yeah. Mum’s always lurking. Loose lips sink ships, mate, and then it’s just awkward cake."
"Don't post the holiday dates before we've booked cover, loose lips sink ships and we'll have the whole team off at once."
"He told one person about the merger and by Friday the whole floor knew, loose lips sink ships."
"Keep the engagement news off Instagram till they've told the grandparents. Loose lips sink ships, and Nana will kick off if she finds out from your story."
"I told you the layoff chat was hush-hush. Loose lips sink ships, mate. Now half the office is acting weird by the kettle."
Where it comes from
It comes from a real American World War II propaganda slogan. The US government used it on posters to warn that careless chatter about troop or ship movements could reach enemy ears and get people killed. The rhyme was sticky, so it survived the war and drifted into everyday speech about secrets and oversharing.
