Bide one's time

Ravenswood, who had assumed the disguise of a sewer upon the occasion, answered, in a stern voice, “I bide my time”; and at the same moment a bull’s head, the ancient symbol of death, was placed upon the table.

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I sat on the rug, biding my time / Drinking her wine / We talked until two / And then she said, "it's time for bed"

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“Some say he died. Codswallop, in my opinion. Dunno if he had enough human left in him to die. Some say he’s still out there, bidin’ his time, like, but I don’ believe it.

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There are times, Machiavelli concedes, where it might be more advantageous to be cautious and bide one's time in order to ascertain the dispensation of the goddess more clearly.

Source: wiktionary