If you say that you will do something, especially an extreme action, if need be, you mean that you will do if it is necessary. In British English, you can also say if needs be. They will now seek permission to take their case to the House of Lords, and, if need be, to the European Court of Human Rights.

What does in case of need mean?

in case of need;f required; When found appropriate ;where necessary; if applicableas occasion shall require; in case of necessity; as the need arises. In case of need.

What is the meaning if need be?

: if something becomes necessary You can always call me at home if need be. We'll leave without them if need be.