ETYMOLOGY
vb. 1: of uncertain origin
vb. 2, 3, 4: apparently from thrum (to press, to condense) + -le
vb. 5: apparently from thrum (to play on a stringed instrument) + -le
EXAMPLE (for vb.3)
“…PETER, quho was ever maist sudden, answers, and sayis: Thou art thrumbled and thrusted be the multitude, and ʒit thou speeris quha hes twitched thee, hee answers againe and he sayis, it is not that twitching that I speak of: It is ane vther kinde of twitching …”
From: Sermons vpon the Sacrament of the Lords Supper
By Robert Bruce, ?1591
Lexicophilia 