plural of tamping machine

(rail transport) A self-propelled rail-mounted machine used to pack or tamp ballast under railway tracks; a ballast tamper.

simple past tense and past participle of tamp down

present participle of tamp down

To compact a substance (usually soil) until it is flat. / (idiomatic, by extension) To suppress (something, usually an emotion or thought).

An iron rod used for beating down the earthy substance in tamping for blasting.

plural of tamping iron