The term "pumps out" implies a forceful expulsion or release of something. Its antonyms would include words like "hold back," "restrain," "repress," and "suppress," all of which suggest the opposite action of withholding or containing something rather than forcing it out. Other antonyms might be "conserve," "preserve," "save," or "protect," which imply taking care to keep something intact and prevent any loss or depletion. Depending on the context, antonyms for "pumps out" could also include phrases like "draws in," "absorbs," or "collects," which suggest the opposite action of taking in or gathering rather than expelling or releasing.