bite your tongue
US /baɪt jʊər tʌŋ/
UK /baɪt jʊər tʌŋ/

1.
menggigit lidah, menahan diri untuk tidak berbicara
to make a conscious effort to avoid saying something that you want to say, often because it would be inappropriate or cause trouble
:
•
I had to bite my tongue to keep from telling him what I really thought.
Saya harus menggigit lidah saya agar tidak mengatakan apa yang sebenarnya saya pikirkan.
•
She wanted to argue, but decided to bite her tongue.
Dia ingin berdebat, tetapi memutuskan untuk menggigit lidahnya.