Kalmar “a cikin kwat da wando na ranar haihuwa” wata magana ce mai ma’ana wacce ke nufin tsirara gaba daya ko tsirara. An yi imanin cewa kalmar “tut na ranar haihuwa” ta samo asali ne daga ra’ayin cewa an haifi mutum tsirara, don haka tsiraicinsu a ranar haihuwarsa ita ce mafi dabi’ar halitta.
