Verb think up has 1 sense
  1. think up, think of, dream up, hatch, concoct - devise or invent; "He thought up a plan to get rich quickly"; "no-one had ever thought of such a clever piece of software"
    --1 is one way to create by mental act, create mentally
    Sample sentence:
    Did he think up his major works over a short period of time?
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