promise

affiance, betroth, plight, troth

accede, agree, assent, consent

contract, engage, ensure, guarantee, undertake

affirm, assert, aver, avouch, avow, declare, insist, warrant

forecast, foretell, predict, presage, prognosticate, prophesy

forewarn, warn

anticipate, divine, foreknow, foresee

betoken, foreshadow, harbinger, portend, prefigure, presignify

indicate, signify

allude, connote, hint, imply, insinuate, intimate, suggest