Short for needs must when the devil drives.

(education) Of an educational institution: accepting pupils based on academic ability etc., rather than their ability to afford the fees.

the absolute minimum resources necessary for long-term physical well-being, usually in terms of consumption goods

plural of hour of need

(idiomatic) the time when help is most needed

past participle of do the needful

plural of need-to-know

(of the giving of information) remaining secret or hidden until it is needed to be known (by a particular party).

plural of number needed to harm

The number of people, statistically, who must be exposed to something in order for one of them to experience an adverse effect.