Meaning of 短刀 in Japanese

Definition of 短刀

たんとう(tantou) 【短刀】

たんとうちょくにゅう(tantouchokunyuu) 【単刀直入 ·短刀直入】

(adj-na, n, adj-no) going right to the point; point-blank; without beating about the bush; frankness
もっと単刀直入に言ってくれないかな。隔靴掻痒の感なきにしもあらずだよ。
You don't have to leave me hanging like this. Why don't you just come out and tell it to me straight?