the.com/quivering
The body's way of leaking a feeling it swore it would hide.
means Trembling with small rapid motions, usually from cold, fear, excitement, or barely contained emotion.
from From Middle English quiveren, likely echoing the Old English cwiferlice, meaning eagerly or briskly — the word itself fidgets.
Not the arrowThat quiver, holding arrows, is unrelated
Survival reflexShivering generates heat through rapid muscle twitching
Lip specialtyThe lower lip betrays emotion before tears arrive