Meaning of 声をそろえる


What is the meaning of 声をそろえる in this conversation:

> 「だからってドロボーの手伝いまですることないじゃない」  
>  お姉ちゃんがあきれたように言うと、ヒロシも **声をそろえた** 。  
>  「そうだぞ。そんなバカなことしない人間に育てるために、厳しくする方がまる子のためだ。...」

Literally I think it means 'to gather/collect/prepare ones voice'.

In English we have the phrase 'collect one's thoughts' e.g. "He collected his
thoughts and then answered the question". So I can think of three
possibilities:

1) It's a combination of collecting your thoughts and then speaking

2) You've become temporarily speechless, because someone said something stupid
for example, and you are getting the ability to speak again.

3) If そろえる means 'prepare' then maybe it means something like clearing your
throat

Are any of these correct?




> 「[声]{こえ}をそろえる」

in this context, means:

> "to say (basically) the same thing about something as others have previously
> said about it"

or in short,

> "to express a similar opinion"

In other situations such as multiple people singing or saying the same thing
together , 「声をそろえる」 means:

> "to sing in unison" or "to speak in one voice" respectively.




> 「[声]{こえ}をそろえる」

in this context, means:

> "to say (basically) the same thing about something as others have previously
> said about it"

or in short,

> "to express a similar opinion"

In other situations such as multiple people singing or saying the same thing
together , 「声をそろえる」 means:

> "to sing in unison" or "to speak in one voice" respectively.

