Of a company, host, people: To increase in numbers. Obsolete.

To grow in numbers, become more numerous or frequent, to multiply; esp. by propagation.

intransitive. To become of great(er) number or quantity; to be increased or augmented by accumulation or repetition.

Of fish, etc.: To cast spawn.

figurative.

intransitive. To increase or multiply; to grow more numerous. Obsolete.

intransitive. gen. To increase rapidly in number; to become numerous or widespread.