바싹

Etymology 1
Perhaps related to Etymology 2 via an intermediary meaning of "like dry or brittle objects"?

Ideophone

 * 1) dryly, aridly, parchedly
 * 2)  in a very scrawny state, malnourishedly
 * 3) while becoming physically close to
 * 4)  suddenly changing by a large amount
 * 5) carefully, earnestly, with rapt attention
 * 1)  suddenly changing by a large amount
 * 2) carefully, earnestly, with rapt attention
 * 1) carefully, earnestly, with rapt attention
 * 1) carefully, earnestly, with rapt attention

Etymology 2
An intensive form of.

Ideophone

 * 1)  quite crunchingly; while lightly stepping on, grinding, or breaking with a crunching sound
 * 2)  quite crunchingly; while biting on with a crunching sound
 * 3)  quite crisply, as to crack easily

Usage notes
is another intensive form of, and is considered more emphatic than.