pack in verb 3pack-in noun 1forms 4 verb3 •To include (especially of a large amount).Though co-star Keanu Reeves considered this new trip unnecessary, the "Speed 2" crew has packed in lots of references from the original. — 1997 •To give up, to quit.Goodbye, old sleepyhead / I'm packing you in like I said / Take care of everything / I'm leaving my wedding ring — 1947 •To transport to base camp, especially by backpack. pack-in noun1 •A product that comes bundled with another product, in the same box.This segment of sales promotion - premiums and incentives — also includes use of contests such as Benson & Hedges' 100 Sweepstakes, as well as factory pack-ins. — 1984 formspacked in · packing in · packs in · pack-ins