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Hello,

The word thumb has been on my mind this week as I sprained mine at the weekend – not via excessive texting but by putting too much weight on it during a rock scramble on a mountain hike in Kerry. As a result I’m typing very carefully today with a swollen thumb.

Teermoyle Mountain, Kerry

Thumb fascinates me as a word because it’s so different to the word finger. Does the lack of a joint really make it so different? One thing I can vouch for this week is a) a swollen thumb is no joke and b) thumbs are really important in human evolution for a reason – they’re vital.

The word thumb has ancient roots in the Indo-European base language where tum meant swell (very appropriate for this week). By the time it reached the prehistoric West Germanic it had become thûmon. From there we get daumen (German),  duim (Dutch), and thumbe in Middle English. This was pronounced as two syllables, thum-be, but over time the second half became silent and we ended up with thumb in English.

Thumb in other European languages has Latin roots instead. Italian pollice and French pouce come from Latin pollex which means strong rather than swollen.

I assume the idea is the thumb looks like a swollen finger. Interestingly the words tumour and tumult have the same root. Phrases involving the thumb are pretty ancient too. We have rule of thumb where it’s a rough approximation of an inch from the 1500s and to be under the thumb was known since the 1580s.

Until next time happy reading, writing, and wordfooling,

Grace (@Wordfoolery)

p.s. mercifully I passed the finish line on NaNoWriMo 2017 before I hurt my thumb, but I’m still mentoring my region.

 

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