Ma'anar ƙamus na kalmar "ƙasa" tana nufin ɓangaren gaba na matakin wasan kwaikwayo wanda ya fi kusa da masu sauraro. Ana amfani da wannan kalma sau da yawa a cikin mahallin wasan kwaikwayo don bayyana ɓangaren matakin da ke kusa da masu sauraro, inda 'yan wasan kwaikwayo sukan tsaya lokacin da suke so a gan su da kyau. Gabaɗaya, "ƙasa" yana nufin ɓangaren dandalin da ya fi kusa da masu kallo ko masu sauraro, yayin da "upstage" yana nufin ɓangaren mataki wanda ya fi nisa.