presume on (或 upon) 1. (不正当地)利用，滥用 presume upon sb.'s good nature 利用某人的好脾气 presume on one's position 滥用职权 2. 指望，把希望寄托于；信赖；依赖，依靠 Don't presume on his consent. 别想当然地以为他一定同意。 We must not presume too much on the reliability of such sources. 我们不应过分信赖这类消息来源的可靠性。