The phrase "synchronize dark" can be interpreted in a variety of ways, and as such, there are several synonyms that could be associated with it. One possible synonymous phrase is "align nighttime," which suggests an effort to coordinate activities or events that occur after sunset. Another possible term could be "harmonize obscurity," which implies a desire to create unity or coherence in a situation or environment that is shrouded in darkness. Additionally, "coincide shadow" could be another synonymous phrase, which denotes an intention to coincide with the dark and operate in tandem with it. Ultimately, the term "synchronize dark" can be understood in multiple ways, and as such, there exist various synonyms for it.