tamp down phrasal verb with tamp verb uk / tæmp / us Add to word list [ T ] to reduce the amount, level, size, or importance of something:

tamp down (third-person singular simple present tamps down, present participle tamping down, simple past and past participle tamped down) To compact a substance (usually soil) until it is flat. (idiomatic, by extension) To suppress or reduce (something, usually an emotion or thought).