Tight-lipped

adj

Definitions

Adjective
  1. 1
    Having the lips pressed tightly together, hence, not speaking.

    "He would have sprung upon Captain Blood, who stood aloof, alert, tight-lipped, and watchful."

  2. 2
    Unwilling to divulge information. idiomatic

    "The open access operator has remained tight-lipped over what may have caused the driver to suddenly apply the brake, but stressed that safety was its priority."

Etymology

From tight + lipped.

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