あらかじめ警告を受けているのは、あらかじめ武装しているに同じ。の英語

Forewarned is forearmed.

The warnings are clear and concrete.

warn in advance or beforehand

someone who gives a warning to others

The police advise people to watch out for purse snatchers:

But the warning was not in time for areas close to the seismic center.

The article struck a note of warning about the dangers of rearmament.

without caution or prudence

I had to see you to give you a warning.

without heed or caution

the warning was to beware of surprises

Sound the alarm only in an emergency.

a warning to be ready for danger

The recantation of a storm warning was made at last in the morning.

I warned you not to do so, didn't I?

There was no warning whatsoever.

they could hear the burglar alarm a mile away

dire warnings

a warning that is given about something that fails to occur

the state there being heavy security

extreme caution is advisable

Alarms came from all quarters.

I've warned you for your own good.

post a warning

The alarm spread like wildfire.

The alarm rang and everyone had to evacuate.

There was a tidal wave warning for the area I'm living in.

a false alarm

The all clear was sounded.

a gun used to fire a shot as a warning