What's "take on" mean? Is this opposite of "take off?"

Native speaker’s answer
Rebecca
Good question! To "take on" something means to undertake or accept a task, responsibility, or challenge. In this case, the speaker saying that Android is proof that Google can take on existing markets, means that Android shows that Google is able to challenge and do well in existing markets (existing competitors in the market). A related expression is to "take on more than what you're able to handle," which means to undertake a task that is too difficult for you to finish or achieve. Ex: I thought I could take on this project, but it's too much for one person. Ex: I took on a new research project at school.