in's

• IPA^(key): /ɪnz/

in's

1. (obsolete) Contraction of in his.
   • 1699, Desiderius Erasmus, Twenty‐two Select Colloquies out of Erasmus Roterodamus, page 65:

     Let Theophilus ſpeak to that point ; for he’s never without Greek in’s Mouth.

• NIS, NSI, Niš, SIN, Sin, nis, sin

in's

1. (proscribed, rare) alternative form of ins

• According to the Duden, almost all prepositional contractions never take an apostrophe. The recommendation is to only use an apostrophe for colloquial prepositional and other contractions if they are otherwise hard to understand.^[1][2]