There are several synonyms that can be used for the word "preengages," which means to involve or commit oneself to something beforehand. Alternatives include precommit, preclude, preempt, foreclose, and prearrange. These words all convey a sense of taking action or making a decision before an event or situation occurs. Precommit implies a prior pledge or promise, while preclude suggests preventing something from happening. Preempt and foreclose both indicate taking action to secure a certain outcome, and prearrange implies planning or organizing ahead of time. These synonyms can be useful in a variety of contexts, from business negotiations to personal relationships.