ad lib🔊

At pleasure.

At will.

As much as desired, to one's fill, without restriction.

Extemporaneously.

Extemporaneous, impromptu.

(acting) An instance of something improvised, especially a line.

(hip-hop) Improvised vocals added after the main vocals have been recorded which serve to emphasize the rhythm or fill the lyrical bar line.

To perform without script.

To perform without preparation.

To perform extemporaneously.

To perform ad libs; to improvise lyrics after the main lyrics have been recorded.

To perform (lyrics) as ad libs.