关于thumb的问题

The short thick digit of the human hand, next to the index finger and opposable to each of the other four digits.
拇指：人手上邻近食指且可与其它四指相对的短而粗的手指
A corresponding digit in other animals, especially primates.Also called pollex
趾：其他动物尤指灵长目动物相对应的趾头也作 pollex
The part of a glove or mitten that covers the thumb.
（手套的）拇指部分：手套或连指手套覆盖拇指的部分
Architecture An ovolo.
【建筑学】 馒形饰
v.（动词）
thumbed,thumb.ing,thumbs
v.tr.（及物动词）
To scan (written matter) by turning over pages with or as if with the thumb.
翻阅，翻查：用或似用拇指翻动（书写物的）纸张以浏览
To disarrange, soil, or wear by careless or frequent handling.
（用拇指）弄坏，弄脏：由于不细心或经常的使用而弄乱、弄脏或磨损
Informal To solicit (a ride) from a passing vehicle by signaling with the thumb.
【非正式用语】 要求搭便车：向路过的车辆坚起拇指请求搭车
v.intr.（不及物动词）
To scan written matter by turning over pages with or as if with the thumb:
翻阅，翻查：用或似用拇指翻动书写物的纸张以浏览：
thumbed through the latest issue of the magazine.
翻阅最近的一期杂志