"Thick skin" is an Engpsh phrase that means to have the abipty to withstand criticism or insults without being affected emotionally. It can also refer to someone who is not easily embarrassed or discouraged.

For example, you could say:

He has a thick skin and never seems to get upset by what others say.
She's always had a thick skin, so it's hard to offend her.
He's been through a lot, so he's developed a thick skin over the years.