A primitive root properly, to be straight or right; by implication, to be acceptable; also to succeed or prosper -- direct, be right, prosper.
H3787. kasher
כָּשֵׁר verb be advantageous, proper, suitable, succeed, late Aramaic (Late Hebrew id.; Aramaic כְּשָׁר, ); —
Qal Perfect3masculine singular הַמֶּלֶךְ לִפְנֵי הַדָּבָר וְכָשֵׁר Esther 8:5 and the thing be proper in the view of the king; Imperfect יִכְשָׁר֨ Ecclesiastes 11:6 thou knowest not whether this shall succeed, or this.
Hiph`il Infinitive construct חָכְמָה הַכְשֵׁיר וְיִתְרוֺן Ecclesiastes 10:10 an advantage for giving success is wisdom.