Dictionary

tight–lipped

adjective \-ˈlipt\

: not willing to speak about something

: having your lips pressed tightly together because you are thinking hard, angry, etc.

Full Definition of TIGHT-LIPPED

1
:  having the lips closed tight (as in determination)
2
:  reluctant to speak :  taciturn
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First Known Use of TIGHT-LIPPED

1876

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