undershorts
From Longman Dictionary of Contemporary Englishundershortsun‧der‧shorts /ˈʌndəʃɔːts $ ˈʌndərʃɔːrts/ noun [plural] underpants for men or boysExamples from the Corpusundershorts• The body of Nichols when found was clad only in undershorts.• Lately, the foundation has cashed in on sales of undershorts.• A few grams can be legitimately shed by stripping to undershorts and T - shirts.• He was wearing undershorts, he remembered that.