Let out of bag and Tip-off

Tip-off and let out of bag are semantically related. In some cases you can replace phrase "Tip-off" with "Let out of bag", this phrases are similar.

Tip-off noun - Something that tells of approaching danger or risk.

Let out of bag and tip-off are semantically related. Sometimes you can use "Let out of bag" instead a verb phrase "Tip-off".