thumb

Pronunciation

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Noun

Singular thumb

Plural thumbs

A hand with the thumb pointing up

1. A thumb is the part of your hand that looks like a short, fat finger. Most people have a thumb on each hand.

   In many countries, pointing your thumb up means, "good".

2. A thumb or thumbnail is a small picture on a computer that you can click on to see a larger picture.

Verb

Plain form thumb

Third-person singular thumbs

Past tense thumbed

Past participle thumbed

Present participle thumbing

1. (transitive) If someone thumbs something, they touch it with the thumb.
2. (slang) When someone thumbs, they are standing by a road waiting for someone to give them a ride.

   I thumbed down a pickup truck to take me to San Antonio.

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