Bringing something under control is a process of subduing, taming, quelling, harnessing, and reining it in. SUBDUE means to bring under domination or control by force, while TAME means to make less violent or powerful. QUELL means to put an end to or suppress, while HARNESS means to put a HARNESS on or to control. Finally, rein in means to restrain or keep within certain limits. All of these terms refer to the process of bringing something under control.