Learn English – meant by the action to ‘curl up your fingers’? Is “Curl up one’s fingers” an English idiom

expressionsidioms

I came across the phrase “His cheeks reddened as he curled up his fingers” in the scene, a six-year-old Ruthenian boy, Lubji Hoch, who later becomes one of the world’s most powerful media moguls, tries to buy an expensive brooch for his mother with small changes at a jewelry shop in Jeffery Archer’s novel, “The Fourth Estate”- P.35:

“The old man didn’t laugh, but gently explained to Lubji that he would
need many more coins than that before he could hope to purchase the
brooch. Lubji’s cheeks reddened as he curled up his fingers and
quickly turned to leave.

What does it mean to “curl up one’s fingers”? I curl in (or inward) my fingers to sqeeze my hand, but I don't think I can curl up my fingers backward without being forced?

Is “curl up one’s fingers” an idiom or cliché to describe special emotions such as an extreme tension or embarrassment, or just a plain description of a bodily reaction?

Best Answer

Note that curl up is a phrasal verb, and means to curl tightly (or fairly tightly). ODO does not make the distinction clear, and OED only mentions it in passing:

curl v
3 a. To bend, twist, or coil up into a spiral or incurved shape; to make curls or undulations upon (a surface); to ripple (water). Often with up.

coil v
3 c. to coil up  : to twist into a fixed or constrained position.

"Curled up his fingers" is not quite the same as "curled his fingers up": in the latter, the fingers end up pointing upward; in the former, they simply end up curled. Compare "curled his fingers down".

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