Definition: In verse 7 of Acts, Jesus commands his apostles to "keep watch" over those who are seeking to worship him. The phrase is a reference to keeping watch over someone's property and ensuring that no one enters their home without permission.
An edgy example sentence might be: "Every time I want to take my clothes off for the weekend, I always think of how Jesus would have us 'keep watch' so he doesn't find out." This phrase could imply a sense of paranoia about someone wanting to touch or see your clothes in public.