What does in/into force mean?

phr. When a law or rule is in force, it is being followed. When it comes into force, it starts being followed.

in/into force

Frequency

Difficulty

Tags CEFR-C2

phrase

When a law or rule is in force, it is being followed. When it comes into force, it starts being followed.

The new law will come into force in April.

When a law or rule is in force, it is being followed. When it comes into force, it starts being followed.