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Definition of Heads-up
1. Adjective. Fully alert and watchful. "Played heads-up ball"
2. Noun. A warning message. "He sent a heads-up to the District Attorney"
Generic synonyms: Warning
Definition of Heads-up
1. Noun. (chiefly US idiomatic) A warning or call to pay attention; an advisory notice. ¹
2. Adjective. With head directly above the neck, eyes front. ¹
3. Adjective. Alert; vigilant ¹
¹ Source: wiktionary.com