(idiomatic) If need be; if there is a need.

(chiefly UK, auxiliary, indicating absence of necessity) Doesn't have to, don't have to. / (auxiliary, indicating inadvisability) Ought not to.

Lacking basic necessities such as food and shelter; poor; indigent. / In distress or otherwise difficult circumstances. / (when followed by “of”) needing (the specified necessities).

plural of needing

(rare) Something that is not needed or is excessive.

A surname.

(India, Nigeria, dated UK) To do that which is necessary or required.

simple past tense of do the needful

Third-person singular simple present indicative form of do the needful

present participle of do the needful