Answer:

warn

Answer	Crossword Clue
WARN	Caution
WARN	Sound the alarm
WARN	Alert

WARN	Give a red flag, e.g.
WARN	Give a caveat
WARN	Use a Bac-a-Larm
WARN	Give a signal
WARN	Notify of peril
WARN	Put on notice
WARN	Say "Better not" to
WARN	Tip off

WARN	Advise
WARN	Give notice
WARN	Shoot off a flare, e.g.
WARN	Honk at, perhaps
WARN	Say "Be careful" to
WARN	Shout "Fore!" to
WARN	Wave a red flag at
WARN	Issue a caveat to

WARN	Advise caution
WARN	Give notice to
WARN	Admonish
WARN	Clue in
WARN	Give a heads-up
WARN	Say "Watch out!" to
WARN	Counsel
WARN	Threaten

WARN	Put on guard
WARN	Give a heads-up to
WARN	Give an alert (to)
WARN	Notify in advance
WARN	Inform of danger
WARN	Advise caution to
WARN	Alert to danger
WARN	Yellow-card

WARN	Caution.
WARN	Admonish.
WARN	Advise of danger.
WARN	Notify in advance.
WARN	Pre-inform.

Crossword

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