プログレッシブ和英中辞典(第4版)の解説
たたきだい【×叩き台】
これは単なる叩き台です
This is just a tentative proposal [plan] to help us focus our discussion.
これを叩き台に議論を進めてくれ
Please use this as a basis [springboard] for discussion.
たたき台として二，三の考えを述べます
To start things off, I'll just toss out a few ideas for you all to think about.