Definition of yean in English:

yean

Pronunciation /yēn/ /jin/

transitive verb

[with object]archaic
  • (of a sheep or goat) give birth to (a lamb or kid)

    ‘the day a lamb was yeaned’
    • ‘the ewes yean in a yard or standing pen’
    • ‘When the Riabhog days are done, the temperature rises, the lambs are yeaned under the hawthorn trees.’
    • ‘The sheep yeaned without any bother and there was no need for overtime in the ‘maternity unit’.’

Origin

Late Middle English perhaps representing an Old English verb related to ēanian ‘to lamb’.