To open or straighten (something) out; unbend: extended the legs of the folding table. To stretch or spread (something) out to greater or fullest length: extended the radio antenna. To exert (oneself) vigorously or to full capacity: Few mountain climbers have extended themselves as those two have. To cause to move at full gallop. Used of a horse. To increase in quantity or bulk by adding a cheaper substance: used rice or pasta to extend leftover casseroles. To adulterate. To enlarge the area, scope, or range of. To expand the influence of. To make more comprehensive or inclusive. See Synonyms at increase. To offer: extend one's greetings. To make available; provide: extend credit to qualified purchasers. To cause (something) to be or last longer: extended our visit by a day. To prolong the time allowed for payment of: extend a loan for three more months. Chiefly British To appraise or assess; value. Chiefly British To seize or make a levy on for the purpose of settling a debt. To be or become long, large, or comprehensive: influence that extended to other continents; table legs that extend by unscrewing.