In artillery, capsquares, or capsquires, are strong plates of iron which come over the trunnions of a cannon, keeping it in its carriage.
ɪn ɑːɹtˈɪlɚɹi, kˈæpskwɛɹz, ɔːɹ kˈæpskwaɪɚz, ɑːɹ stɹˈɔŋ plˈeɪts ʌv ˈaɪɚn wˌɪtʃ kˈʌm ˌoʊvɚ ðə tɹˈʌniənz əvə kˈænən, kˈiːpɪŋ ɪɾ ɪn ɪts kˈæɹɪdʒ.