'Round-arm' definitions:

Definition of 'round-arm'

From: WordNet
adverb
With an outward or horizontal swing of the arm; "he hit the ball round-arm"
adjective
With the arm swung round at shoulder height; "round-arm bowling"

Definition of 'Round-arm'

From: GCIDE
  • Round-arm \Round"-arm`\, a. (Cricket) Applied to the method delivering the ball in bowling, by swinging the arm horizontally. --R. A. Proctor. [1913 Webster]