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stumbling block - something that prevents or obstructs progress The issue of salary was a stumbling block in the negotiations between the company and the union. subject to (something) - depending on something, likely to have something The purchase of the house was subject to several conditions that we wanted to talk about. subscribe to (something) - to have a standing order for a magazine or something similar, to give support or consent to something I subscribe to several magazines but I do not have time to read them. I do not subscribe to our teacher's ideas about many topics. such and such - someone or something.