Answer:

warns

Answer	Crossword Clue
WARNS	Issues a threat
WARNS	Raises a red flag
WARNS	Tips off

WARNS	Alerts
WARNS	Cautions
WARNS	Sounds the alarm
WARNS	Admonishes
WARNS	Gives a "heads up" to
WARNS	Shoots off a flare, maybe
WARNS	Gives a heads-up to
WARNS	Signals danger

WARNS	Sounds the sirens
WARNS	Tells of danger
WARNS	Gives notice
WARNS	Gives notice.
WARNS	This Paul Revere does.
WARNS	Predicts trouble.
WARNS	Alerts.
WARNS	Sounds a signal.

WARNS	Cautions.
WARNS	Admonishes.
WARNS	Notifies in advance.
WARNS	Reads the riot act
WARNS	Emulates Cassandra
WARNS	Counsels
WARNS	Puts on guard
WARNS	Apprizes

WARNS	Gives safety information
WARNS	Yells "Heads up!" at
WARNS	Issues an advisory
WARNS	Gives a yellow flag
WARNS	Gives the high sign to
WARNS	Premonishes

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.