To tell someone confidently that something is true or will happen in order to dispel doubt. Can also mean to make certain that something will occur.
From Old French 'asseurer,' built from Latin 'ad' (to) + 'securus' (secure). Originally meant 'to make secure' and evolved to mean making someone feel secure through confident statements.
Remember: 'assure' requires a PERSON - you assure someone OF something. Think 'A-sure' - you make that person 'A-okay' and sure about the situation!
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