"Hammer in" is a common phrase used to refer to the act of driving a nail or other object into a surface. However, there are many synonyms for this phrase that can be used to add variety to your writing. Some of these synonyms include "pound in," "drive home," "embed," "plant," "bury," "install," "secure," "fix," and "affix." Each of these synonyms can be used in different contexts to convey a slightly different meaning, so it's important to choose the right one based on the situation. Using synonyms for common phrases like "hammer in" can help make your writing more interesting and engaging.