re·think • v. / rēˈ[unvoicedth]ingk/ (past and past part. -thought) [tr.] think again about (something such as a policy or course of action), esp. in order to make changes to it: the government was forced to rethink its plans | [intr.] I've had to rethink. • n. / ˈrēˌ[unvoicedth]ingk/ [in sing.] a reassessment of something, esp. one that results in changes being made: a last-minute rethink of their tactics.