tampˈer noun

1. A person or thing that tamps
2. An instrument for pressing down tobacco in a pipe
3. A casting round the core of a nuclear weapon to delay expansion and act as a neutron reflector

tampˈing noun

1. The act of filling up a hole for blasting
2. The material used

tamp down (informal)

To bend the thumb over the neck of a guitar and hold down (one or more bass strings) with it

tamper¹ /tamˈpər/

1. (usu with with) to interfere unwarrantably or damagingly
2. To meddle
3. To work, contrive or practise
4. To have secret or corrupt dealings

To temper (eg clay)

tamˈperer noun

tamˈpering noun

tamper-evˈident adjective

(of packaging) designed in such a way that it is obvious when it has been tampered with

tampˈer-proof adjective

(of locks, etc) that cannot be tampered with

tamper-resistˈant adjective