The word 'forestallings' refers to the act of preventing or obstructing something from happening. Its antonym would be a word that means to allow or facilitate something. Possible antonyms for 'forestallings' could include words like 'encouragement', 'promotion', 'facilitation', 'support', 'promotion', 'encouragement', 'assistance', or 'aid', which all connote the idea of enabling or promoting something. Other antonyms might emphasize the opposite action of preventing, such as 'permitting', 'allowing', 'indulging', 'fostering', or 'supporting', which all suggest the idea of letting something happen or take place.