PIE base ‘to taste, become aware’. See also *gnō- ‘to know’; *weid- ‘to see, know’, root of vision; *wer-³ ‘to perceive, watch out for’, root of aware and theory; and *spek- ‘to observe’, root of species and specialist.
Other derivatives include sapient, savant, savour, insipid, and Homo sapiens ‘wise human’, from Latin sapere ‘to taste, have a flavour; to discern, be sensible, be wise, think’, root of French savoir ‘to know’.
[Pokorny *sap-, sab-, p. 880.]