She bit the tip of her left thumb, not looking at me.

她咬着左手的大拇指头，也不看我。

《柯林斯英汉双解大词典》

A teaspoon of butter is the about the size of your thumb tip.

1茶勺黄油和你拇指尖的大小相仿。

youdao

Objective To present application of a reverse fascial flap from neighboring digital with the dorsal branch of the proper digital nerve for repair thumb tip defect.

目的介绍应用带指固有神经背侧支的逆行邻指筋膜蒂皮瓣修复拇指指端缺损。

youdao

Dr Ritchie, a consultant surgeon in the accident and emergency department of Victoria Infirmary in Glasgow, told the court that having a thumb or the tip of a finger amputated would be "painful".

BBC: Lynda Spence trial: Alleged injuries would be 'painful'

The 58-year-old consultant surgeon said that having a thumb or the tip of a finger amputated would be "painful".

BBC: Lynda Spence trial: Alleged injuries would be 'painful'

She had the tip of her pinkie finger cut off and her thumb and her toe crushed.

BBC: Lynda Spence