reject
The factory will reject reject parts to maintain quality.
The sentence describes a factory discarding defective parts to maintain product quality.

Meanings
to refuse to accept, agree to, or use; to dismiss or discard
- The committee rejected the proposal.
- The body rejected the transplanted organ.
an item or person not accepted because of failing to meet standards
- The factory sold rejects at a discount.
- The team's rejects went on to play in a smaller league.
Word origin
From Latin reicere ('to throw back'), formed from re- ('back') + iacere ('to throw'). The same root iacere produces 'project', 'inject', 'subject', 'object', and 'eject'. The verb-noun stress alternation follows the trochaic noun rule.
Fun fact
'Reject' the noun is informal in tone — calling something or someone 'a reject' has a slightly cruel edge. Compare with 'discard' (more neutral, used in card games) or 'second' (a flawed manufactured item, sold at a discount). English has many words for rejected things, each with its own social register.