The term "doing in" has several synonyms, depending on the context in which it is used. For example, if it means killing someone, the synonyms are murdering, eliminating, executing, or assassinating. In the sense of destroying or defeating something, the synonyms are demolishing, ruining, dismantling, or undermining. When it means exhausting someone, the synonyms include draining, tiring, exhausting, or wearing out. In the sense of deceiving someone, the synonyms for "doing in" are fooling, tricking, duping, or deceiving. In any case, the context is crucial since the meaning of "doing in" can vary based on the situation in which it is used.