Sentence:  The terms are fairly safe to use on this side of the ocean , but before you start spouting them to your date , it might be best to <WSD>find</WSD> out if he was a member of Major Pockmanster 's Delhi Regiment , since resentment toward the natives was reportedly very high in that outfit . 
Meaning of the word marked with <WSD> tags:  establish after a calculation, investigation, experiment, survey, or study