if so; in that case; in that situation
Conditional conjunction meaning 'if you do that' or 'if that is the case'. Used to present a consequence or suggestion based on a preceding statement.
急げ、そうすれば間に合う。
Hurry up, and you'll be in time.
もっと勉強しなさい。そうすれば試験に合格できるよ。
Study harder. If you do, you'll pass the exam.
そうすれば is the fuller, more common form of すれば meaning 'if you do that,' and is the safer everyday choice, while bare すれば can sound clipped or literary.
Compound of そう (so, like that) and the conditional form すれば of する (to do).