si1 mou5絲母丝母

Jyutpingsi1 mou5
Yalesī móuh

Definition

A screw nut; a type of hardware used with bolts to fasten objects.

colloquialother

How it's used

Refers specifically to the female threaded component used to fasten a bolt. While the term is widely understood, many speakers prefer the more explicit 螺絲帽 to avoid any potential confusion with the word for silk or thread. It is strictly a technical term for hardware and is not used metaphorically in daily speech.

Measure word

nap1nāp

Common phrases

to tighten a nut
the nut's threads are stripped

Common mistake

Learners often confuse this with 螺絲, which refers to the bolt or screw itself. Remember that 絲母 is the piece that receives the screw, not the screw itself.

Grammar color guide

Noun
Verb
Adjective
Adverb
Pronoun
Classifier
Particle
Connector