When it comes to synonyms for the phrase "in field," there are several options that can be used depending on the context. For example, if you are talking about someone who is working in the field or out in the open air, you could use terms such as outdoors, outside, or in the open. If you are referring to someone who is working in a specific field of study, you may opt for synonyms like expert or specialist. Similarly, if you are referring to someone who is currently playing in a field or turf, you can use synonyms like on the pitch, on the field, or on the court. Ultimately, choosing the right synonym for "in field" will depend on the specific context of your usage.