"Give the heave" is a colloquial expression that means to dismiss or fire someone, usually from a job or position. There are several synonyms for this phrase, such as "sack", "terminate", "let go", "axe", "pink slip", "lay off", "cut loose", "boot out", "oust", and "dismiss".
Each of these synonyms has a slightly different meaning or connotation. For example, "terminate" or "dismiss" might imply a more formal or official departure, while "pink slip" or "axe" might suggest a sudden and unexpected firing. Regardless of the phrasing used, being let go from a job or position can be a challenging and stressful experience, and it's important to handle the situation with professionalism and grace.