Ma'anar ƙamus na kalmar "tushe" ita ce tushen tallafi ko ginshiƙan wani abu, wanda aka gina shi ko aka gina shi. Hakanan yana iya komawa zuwa wurin farawa ko tushe na asali wanda aka kafa ko gina wani abu akai. A cikin sharuddan ilmin lissafi, yana iya komawa zuwa saitin vectors waɗanda suka mamaye wani sarari ko ƙarƙashin ƙasa. A cikin amfani na kowa, ana iya amfani da kalmar "tushe" a cikin jimloli kamar "bisa," ma'ana an yi wani abu ko yanke hukunci saboda wani dalili ko hujja.