When we want to indicate that someone has decided to take responsibility or action for something, we often use the phrase "take upon." However, there are a variety of synonyms that can be used in place of this phrase. Some examples of synonyms for "take upon" include assume, adopt, undertake, shoulder, bear, accept, tackle, and embrace. Each of these verbs carries a slightly different connotation and may be used in specific circumstances depending on the context in which they are used. Nonetheless, these alternatives can help add variety to your writing and perhaps even make your message clearer.