at liberty, as much as one likes
Nach Belieben, in beliebiger Menge oder nach eigenem Ermessen.
As much as one desires or at one's discretion.
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Die Beilage kann ad libitum nachgefüllt werden.— The side dish can be refilled as much as you like.
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Der Solist spielt die Passage ad libitum.— The soloist plays the passage at liberty.