PIE base ‘to give, donate’. See also dhē, root of Latin dare ‘to cause’.
Other derivatives include betray, surrender, vend, dose, and antidote. Also Latin dare ‘to give’ and Sanskrit dā ‘to give, bestow, grant, yield, present, offer to’, root of aditi ‘not tied, free; boundless; unbroken, entire, happy’.
[Pokorny *dō- : də-, also dō-u- : dəu- : du-, pp. 223–226.]