Phoned it in

(verb) to have completed an action, especially giving a performance, while showing a minimum of effort.

Generally used to refer to performances that border on unprofessional. The intended audience would have been similarly disappointed if the person had delivered the performance by speakerphone, in order to spend more time on leisurely pursuits.

"Her song and dance routine at the music awards was horrible! She looked out of shape, she forgot half the words... she basically just phoned it in."

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