Definition of SIL in English:

SIL

Syllabification: SIL

noun

informal
  • 1A person’s sister-in-law: I think you should tell your SIL that you found her comments upsetting
    More example sentences
    • Quite frankly, I think your SIL should grow up and get over herself.
    • I told my SIL if she were to go through the operation I would take time off work to look after her and her children.
    • My nephew has more toys, books and clothes than he needs, and my SIL can find them at better prices than I can anyway.
  • 2A person’s son-in-law: my SIL lives in the UK with our DD and their son
    More example sentences
    • As a reward for helping with the kids, my wonderful SIL and DD took me to Menton's for dinner the night before I left.
    • Your SIL and DD should take some parenting classes.
    • My SiL is in full-time employment and is back living with his mother.

Origin

1960s: abbreviation.

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