When it comes to referring to time, "in the afternoon" is a commonly used phrase. However, there are several synonyms for this phrase that can add variety to your writing or speech. Some possible synonyms include "later in the day," "in the post-lunch hours," "during daylight hours," "after midday," and "towards evening." Additionally, depending on the context, you could use more informal phrases such as "in the middle of the day," "in the heat of the afternoon," or "when the sun is high in the sky." It's important to choose the synonym that best fits the tone and context of your communication.