/sook/ , n.
1. Australia and New Zealand. a timid, cowardly person, esp. a young person; crybaby.
interj.
2. Midland U.S. (used to summon cows from the pasture).
[ 1890-95; prob. from earlier sense "calf reared by hand," perh. suck (- calf ), with sp. repr. N England, Scots pron. of SUCK (but earliest cited pron. of sook is /soohk/) ]