make sure

动词verb

1. 1To ensure that something specific happens, is done etc., or of something happening. [from 16th c.]
2. 2To make oneself certain (of something, or that something is the case); to verify, to ascertain. [from 17th c.]
3. 3now rareTo feel certain of something; to be convinced. [from 18th c.]
4. 4obsoleteTo betroth.