tottering steps meaning in English

蹒跚的步子

And all of a sudden at such moments , that father whom she was judging would look for his spectacles , fumbling by them and not seeing them , or would forget what had just happened , or would take a tottering step with his weak legs , and look round to see whether any one had noticed his feebleness , or what was worst of all , at dinner when there were no guests to excite him , he would suddenly fall asleep , letting his napkin drop and his shaking head sink over his plate
在这种时刻，她所谴责的父亲忽然在她面前寻找眼镜，在眼镜旁边摸来摸去，没有看见或者竟然把刚才发生的事情忘记得一干二净，或者伸出他那软弱无力的两腿，摇晃不定地走了一步，他回头望望，是否有人看见他那有衰弱的体态，或者更糟的是，用午餐时，在没有客人使他兴奋时，他忽然微微入睡，放开身上的餐巾，他那巍巍颤颤的脑袋低垂在餐盘上。