In Solidum
Bouvier's Law Dictionary and Concise Encyclopedia · John Bouvier; revised by Francis Rawle · 1914
Bouvier's Law Dictionary and Concise Encyclopedia
IN SOLIDO (Lat). In Civil Law. For the whole; as a whole. An obligation or contract is said to be in solido or in solidum when each is liable for the whole, but so that a payment by one is payment for all: i. e. it is a joint and several contract 1 W. Bla. 3S8. I'ossession is said to be in solidum when it is exclusive. “Duo in solidum precario habere non magis possunt quam duo in solidum vi possidere aut clam; nam neque justce neque injustw posscssiones dues concurrcrc possunt." Savigny, lib.
3, § 11.
The phrase is commonly used in Louisiana.