v
.
to improvise ; speak or act spontaneously
즉흥적으로 만들다 ; 자연스럽게 말하거나 행동하다
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Teddy hadn't known that he would be asked to speak after dinner, so when he was called to the microphone, he had to ad-lib.
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The director complained that the lazy star hadn't memorized his lines ; instead of following the script, he ad-libbed in nearly every scene.