sack up
v.— «My only response to diablo is to sack up and grow a pair.» —“Re: Love and Death” by maszakj@pell1l8.alleg.edu (Jonathan Maszak) Usent: alt.romance.chat Mar. 11, 1994. (source: Double-Tongued Dictionary)
Further reading
Ever wonder what medieval England looked and sounded like? In Old English, the word hord meant “treasure” and your wordhord was the treasure of words locked up inside you. A delightful new book uses the language of that period to create...
Miley in The Dalles, Oregon, asks about going gunny bags meaning to “break down” or “go haywire.” Her mother uses this expression, but has no idea where she picked it up. The term gunny sack, referring to a bag made of coarse material such as jute...