initiateஉபதேசிupatēci(ubadeesi)(6b tr)teach, as spiritual or occult truths; impart, as a secret mantra, doctrine, etc.
Usage:
என் குரு எனக்கு இந்த மந்திரத்தை உபடுதசித்தார்eṉ kuru eṉakku inta mantirattai upaṭutacittār
en guru enakku inda mandratte ubadeesiccaar
He taught me this mantra (He initiated me into the mysteries of this mantra).