集思广益的英文：
[Literal Meaning]
collect/idea/expand/benefit
to draw on the wisdom of the masses and enlarge benefits

[解释]
集中众人智慧，广泛进行讨论。

[Explanation]
to brainstorm; synectics

[例子]
对于建造水坝的事，我们应该集思广益，避免犯错误。

[Example]
We should brainstorm about the issue of building the dam and try not to make mistakes.

[英文等价词]
put/lay heads together

Let's put our heads together and decide on a plan of action.
让我们集思广益，决定一项行动计划。

If we put our heads together we can probably thresh out a workable scheme.
如果我们集思广益，也许能琢磨出一个切实可行的方案。