Thrum cap, a knitted cap. Halliwell. - - Thrum hat, a hat made of
coarse woolen cloth. Minsheu.
Thrum, v. t. [imp. & p. p. Thrummed (?); p. pr. & vb. n. Thrumming.] 1.
To furnish with thrums; to insert tufts in; to fringe.
Are we born to thrum caps or pick straw?
Quarles.
2. (Naut.) To insert short pieces of rope- yarn or spun yarn in; as, to
thrum a piece of canvas, or a mat, thus making a rough or tufted
surface. Totten.
Thrum, v. i. [CF. Icel. &?;ruma to rattle, to thunder, and E. drum.] 1.
To play rudely or monotonously on a stringed instrument with the
fingers; to strum.