clam up

I think that's why I tend to clam up.
Por eso tiendo a quedarme callada.
We're not saying you have to clam up like a CIA operative: but the alarm bells should ring if you think it's all one-way traffic.
No estamos diciendo que debes ser herméticamente cerrado como un agente de la CIA, pero las señales de alarma deberían sonar si crees que el tráfico solo va hacia un lado.
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