The phrase "hanging back" is often used to describe hesitation or reluctance to take action. There are several synonyms that can be used to convey a similar message, such as lingering, loitering, or dawdling. These words suggest a lack of urgency or motivation, and imply that the individual may be waiting for something or unsure of what to do next. Other synonyms for "hanging back" include hesitating, procrastinating, and vacillating. Whether used in professional or everyday conversation, these terms can help communicate a sense of hesitancy or indecision, and help to clarify the speaker's intentions.