1To throw or slam something violently against a surface; to strike or dash something down with force.
彼は腹を立ててコートを床に叩きつけた。
He angrily slammed his coat down on the floor.
子どもがぬいぐるみをテーブルに叩きつけた。
The child threw the stuffed toy onto the table.
波が岩に叩きつける音が聞こえる。
You can hear the sound of waves smashing against the rocks.
2To thrust something at someone (e.g., a letter), as in forcing it into their hands; often implies aggression or emphasis.
彼女は契約書をテーブルに叩きつけ、『署名して』と言った。
She slammed the contract onto the table and said, 'Sign it.'
抗議者は嘆願書を市長の前に叩きつけた。
Protesters thrust the petition in front of the mayor.