contraction of had: I was glad they'd gone.
contraction of did: Where'd they go?
contraction of should or would:He'd like to go. I'd like to remind you of your promise.
contraction of -ed: She OK'd the plan.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for 'd
would or hadI'd; you'd
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012