consolidate

To combine into a single unit; to group together or join.

He consolidated his luggage into a single large bag.

With large credits borrowed in the name of Charlottenhütte he managed to gain control over the Rhein-Elbe Union, another large steel firm which in 1926 consolidated with one of its subcompanies, the old and respected Gelsenkirchen Mining Company, and assumed the latter’s name.

To make stronger or more solid.

These infamous little green men appeared during the decisive seizures or buildings and facilities, only to disappear when associated militias and local troops arrived to consolidate the gains. In this way they provided a measure of deniability—however superficial or implausible—for Moscow.⁴⁰

With respect to debt, to pay off several debts with a single loan.

Formed into a solid mass; made firm; consolidated.

A gentleman [should learn to ride] while he is tender and the brawns and sinews of his thighs not fully consolidate.