A person who creates or imposes an entailment on property, especially a legal action that restricts how land or inheritance can be transferred.
From 'entail' (legal term for restricting inheritance) + '-er' (agent suffix meaning one who does something). The legal term 'entail' comes from Old French 'entailler' (to limit, cut into).
Medieval and early modern 'entailers' were usually wealthy fathers trying to protect family estates—they created complex legal documents that bound property to sons and their sons forever, which sometimes backfired when younger sons felt trapped by their older brother's inherited wealth.
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