Definition of "heads-up" []

• Showing an alert, competent style: play heads-up basketball. (adjective)
• Informal Information or notification, especially in advance: gave me the heads-up on the new security measures. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "AT&T says it's confident the merger will be approved; it gave what it described as a "heads-up" call to the FCC before the announcement, and has offered a "breakup fee" of $3 billion and some spectrum to T-Mobile should the deal fall through."
• "Called heads-up displays, they provide pilots with improved visibility in bad weather while also allowing them to see critical flight-control information at eye level, without having to glance down at instrument screens."
• "I wanted to give you a heads-up that Netty will be visiting next weekend."