"Lay it on with a trowel" is a common expression used to describe someone who is being excessively complimentary or exaggerating their praise. However, there are other phrases that convey a similar sentiment, such as "buttering up", "laying it on thick", or "flattering". These synonyms indicate that someone is being overly generous with their words, often with the intention of wining someone over or gaining some sort of advantage. While it is important to give genuine compliments when warranted, it's equally important to avoid going overboard and risking coming across as insincere or manipulative.