(computing, informal) To create something of which an analogue is commercially available.

plural of roll-your-own

A type of cigarette made by the smoker by rolling loose tobacco in a rectangle of paper.

On one's own behalf. / By oneself. / At one's own risk.

(idiomatic) To reach a stage of development or maturity where one has achieved strength and confidence, economic security, or respect and social acceptance.

(informal) On one's own account or responsibility; by oneself.

(idiomatic) To turn on and attack members of one's own group or clique.

(India) The state of Kerala. / (Britain) The county of Yorkshire.

Dealing with a matter with which one is familiar or expert.

For one's own private use.