To experience and accept adversity, challenges, etc. The term typically implies that one perseveres without complaint despite such negative experiences. I know that I have to take my lumps as an intern to earn the other employees' trust and move up the corporate ladder.
take one’s lumps
tv. to accept the result or punishment one deserves. (see also get one’s lumps.) You’ve got to learn to take your lumps if you’re going to be in politics.