If you do something underfalsepretences, youlieabout who you are, what you are doing, or what youintendto do, inorderto get something:
He wasdeportedforenteringthecountryunderfalsepretences.
If you're not going toofferme ajob, then you'vebroughtme here underfalsepretences(= you havedeceivedme inorderto make me come here).
I'mafraidI'm here underfalsepretences. I said I wasrepresentingaclient, but that's nottrue.
I got into thebuildingunderfalsepretences, but I didn't have anychoice.
Theykepthimlockedup foryearsunderfalsepretences.