drop (your) guard

to stop being careful about sharing your ideas or feelings.

Once he knew I wasn't a journalist, he dropped his guard and even let me take a photograph of him.

• a laughing stock
• a laundry list
• a law unto
• a law unto yourself
• albatross around neck
• give the thumbs up
• give the time of day
• give the willies
• give the works
• give to on a plate
• give to on a platter
• give to on a silver platter
• give to someone on a plate
• give to someone on a platter
• give to someone on a silver platter
• give tuppence
• give up
• give up as a bad job
• give up on
• give up on someone
• give up on something
• give up something
• give up the ghost
• Give us a break!
• give walking papers