[let one in on] {v. phr.} To reveal a secret to; […]

[let one's hair down] or [let down one's hair] {v. phr.}, […]

[let one's left hand know what one's right hand is doing] […]

[let oneself go] See: [LET GO] (6).

[let out] {v.} 1a. To allow to go out or escape. […]

[let pass] {v. phr.} To disregard; overlook. * /Herb may have […]

[let ride] {v. phr.}, {informal} To allow to go on without […]

[let sleeping dogs lie] Do not make (someone) angry and cause […]

[let slip] {v. phr.} To unintentionally reveal. * /Ellen let it […]

[let the cat out of the bag] {v. phr.}, {informal} To […]