Pack-in Definition

verb

(idiomatic) To give up, to quit.

January 1989, American Motorcyclist‎I rode 700 miles one day before packing it in for the night, yet after 15 minutes of rest in my hotel room, I realized that I could have gone farther.

6 Febraury 2009, Yahoo! News - At Dem retreat, a partisan love festAs the Senate deliberated in Washington – and packed it in for the night without finalizing a deal — Obama brushed pressed House Democrats to finalize.

7 November 2009, The Sun - Captain Crunch compares 'greener' light bulbsLAST year I was diagnosed with cervical cancer and had to pack in my job as a full-time cleaner as I needed chemo and radiotherapy.

Wiktionary

(idiomatic) To include (especially of a large amount)

13 June 1997, Los Angeles Times - MOVIE REVIEW Speed 2: Cruise ControlThough co-star Keanu Reeves considered this new trip unnecessary, the "Speed 2" crew has packed in lots of references from the original.

Wiktionary

(American football)

Wiktionary