GUARANTEE
ADJECTIVES
1534 — COCKSURE certain to happen or be attained; guaranteed → obs.
1548 — WELL-WARRANTED guaranteed or sanctioned by good authority
1846 — SUREFIRE certain to succeed or attain the desired end, guaranteed → colloq., orig. US
1895 — SURE-SHOT certain to succeed or attain the desired end, guaranteed → colloq., orig. US
1901 — AIR-TIGHT guaranteed, assured → orig. US
1980 — SLAM-DUNK certain to succeed or achieve the desired outcome; guaranteed → US colloq.
NOUNS
1000 — WORD a promise, a pledge; a guarantee
1249 — HANDWARSEL a pledge or guarantee; surety → Sc. obs.
1300 — SURANCE a pledge, guarantee → obs.
1400 — UNDERTAKING a pledge or promise; a guarantee or surety → obs.
1574 — AVOUCHMENT assurance, guarantee; positive declaration
1603 — AVOUCH guarantee, assurance → arch.
1616 — VOUCHER something serving to confirm or prove something; a guarantee
1966 — OKLAHOMA GUARANTEE no guarantee → US sl.
VERBS
1400 — AGRAUNTE to acknowledge, guarantee, or promise something → obs.
1400 — AWARRANT to vouch for, to guarantee, to warrant → obs.
1450 — AFFY to guarantee a fact; to affirm or promise that something is the case
1530 — AVOW to vouch for, to guarantee → obs.
1530 — UPHOLD to warrant or guarantee a fact → chiefly Sc. & Eng. dial.
1532 — AVOUCH to give assurance, to guarantee, to vouch
1547 — GAGE to pledge, to offer as a guarantee or forfeit one’s head, life, etc.
1599 — RATIFY to confirm, to guarantee or ensure the fulfilment of → obs.
1894 — GALANTEE • GALLANTEE to guarantee, to warrant → Eng. dial.
..20C — CINCH to guarantee; to seize on or make sure of → colloq.
1902 — INSURE to assure, to pledge one’s word; to make sure; to guarantee → Eng. dial. & Amer. dial. (Bk.)
1949 — GABOUND to guarantee, to warrant → Sc.
Lexicophilia 