言いわせておく

expression, godan verb (-ku)

let someone say (without interfering)

Used when you allow someone to speak freely, often implying you will not argue or correct them, or that you are ignoring what they say. The ておく form adds a nuance of leaving the action as is.

• 彼かれが何なにを言いっても言いわせておけばいい。

  Just let him say whatever he wants.

• 文もん句くがあるなら言いわせておこう。

  If they have complaints, let them speak.