Ma'anar ƙamus na "matattarar matashin kai" yana nufin abin rufe matashin kai, wanda yawanci ana yin shi da masana'anta, wanda ake zamewa a kan matashin don kare shi ko don kayan ado. A wasu yankuna, ana kuma kiran wannan abu a matsayin "akwatin matashin kai."
