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Etymology · Old English

þweran

3 English words descend from Old English þweran, most common first.

trillA rapid alternation between an indicated note and the one above it as an ornament; in musical notation usually indicated with the letters tr written above the staff.
tirlTo quiver; to vibrate; to veer about.
twireTo glance shyly or slyly; look askance; make eyes; leer; peer; pry.