(uncountable, usually) In Scotland, a landlord's right over the stocking (cattle, implements, etc.), and crops of his tenant, as security for payment of rent.
(uncountable, usually) In Québec, a legal right over property used as security for an obligation, such as a mortgage.
(colloquial, uncountable, usually) Everything; the whole lot.
Etymology
From Latin hypothēca (“pledge, mortgage”), from Ancient Greek ὑποθήκη (hupothḗkē, “warning, pledge”).