principale

dative form-of imperative object-singular object-third-person second-person singular with-voseo

principar combined with le の二人称単数ボセオ命令形

English Meaning

second-person singular voseo imperative of principar combined with le

Si querés que tu compañero se sume al proyecto, principale para motivarlo.

もしあなたの同僚にプロジェクトに参加してもらいたいなら、彼を励ましてあげなさい。

If you want your colleague to join the project, encourage him to do so.