tamp
verb- tamp something (down)
to press something down hard, especially into a closed space 捣实；压实；塞紧 He tamped down the tobacco in his pipe with his thumb. 他用拇指把烟斗里的烟草捣实。
Word Originearly 19th cent.: probably a back-formation from tampin (interpreted as ‘tamping’), variant of tampion.