I let the secret about the surprise party spill out 'in an unguarded moment'.
an 'unguarded' remark
an 'unguarded' border
(..) we're losing her. Oh, my God! I shoulda stayed on the bus. Where you going? The Time Stone's been taken. The Sanctum remains unguarded. What will you do? I'm gonna make a call. Sing it, Drax! Why are we doing this again? It's a distress signal, (..)2018 Avengers: Infinity War