"Crush out" is a phrasal verb used to describe the act of forcefully putting out or extinguishing something such as a fire or a cigarette. However, there are various synonyms that can be used in place of "crush out" such as douse, snuff out, smother, quench, and suppress. Douse involves the act of pouring a liquid such as water to extinguish a fire, while snuff out means to put an end to something suddenly or extinguish a flame. Smother and quench both refer to the act of suffocating or extinguishing a fire completely, while suppress means to prevent or restrain the expansion of something. Regardless of the synonym used, the goal is to extinguish something completely or put it to an end.