Heads-up and Keep an eye out

Heads-up noun - The act or an instance of telling beforehand of danger or risk.

Keep an eye out and heads-up are semantically related. In some cases you can use "Keep an eye out" instead a verb phrase "Heads-up".

Heads-up and keep an eye out are semantically related. Sometimes you can replace phrase "Heads-up" with "Keep an eye out", this terms are similar.