More than one option or set of resources: “Samantha has two strings to her bow; if her career in politics falls through, she can fall back on her law practice.”
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two of a kind
two shakes of a lamb's tail
two shakes of a lamb's tail (idioms)
Two Sicilies
two strikes against
two strings to one's bow (idioms)
two video cards
two ways about it
two wrongs do not make a right
Two wrongs don't make a right