thrums is a form of:

Thrum



noun
1.
(A thrumming sound) សំឡេងដេញ, សំឡេងគោះ (ភ្លេង)
2.
(1. Music. To strum idly on a stringed instrument. 2. To speak in a monotonous tone of voice; drone) ដេញ, គោះដោយម្រាមដៃ (ភ្លេង)
verbpast tense: thrummed ; past participle: thrummed ; present participle: thrumming ;
1.
(TRANSITIVE) (1. Music. To play [a stringed instrument] idly or monotonously: thrummed a guitar. 2. To speak, repeat, or recite in a monotonous tone of voice; drone) លេងភ្លេង, កេះហ្គីតា, គោះដោយម្រាមដៃ (ភ្លេង)
ENGLISH MEANING
noun
1.
One of the ends of weaver's threads; hence, any soft, short threads or tufts resembling these.
2.
Any coarse yarn; an unraveled strand of rope.
3.
A threadlike part of a flower; a stamen.
4.
A shove out of place; a small displacement or fault along a seam.
5.
A mat made of canvas and tufts of yarn.
verbpast tense: thrummed ; past participle: thrummed ; present participle: thrumming ;
1.
(TRANSITIVE) To furnish with thrums; to insert tufts in; to fringe.
2.
(TRANSITIVE) 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.
3.
(INTRANSITIVE) To play rudely or monotonously on a stringed instrument with the fingers; to strum.
4.
(INTRANSITIVE) Hence, to make a monotonous drumming noise; as, to thrum on a table.
5.
(TRANSITIVE) To play, as a stringed instrument, in a rude or monotonous manner.
6.
(TRANSITIVE) Hence, to drum on; to strike in a monotonous manner; to thrum the table.