thumb
Transitive Verb[C/U] Both
pl: thumbspp: thumbeding: thumbing
The thumb is the primary tool of human dexterity, providing the grip and pressure necessary for complex tasks. Because it is the only digit capable of opposing the others, it symbolizes control and manual skill in various cultural contexts.
Countable when referring to the physical digit on a hand. Uncountable when referring to the quality of being skilled, as in having a green thumb for gardening.