"Give his or her walking papers" is a phrase that means to dismiss or fire someone from their job. However, there are several other synonyms for this phrase that can be used in professional or casual settings. For instance, one can use "terminate employment," "let go," "fire," "sack," "release," or "lay off." Additionally, one can incorporate idiomatic expressions such as "pink slip," "get the boot," "be given the ax," "get the sack," "be handed their hat," "receive the walking papers," and "be shown the door." Whether in a formal or informal setting, it is important to select the appropriate synonym to effectively communicate the message of letting someone go from their job.