Base on Balls is a term used in baseball to describe a situation when a batter is awarded first base without having to hit the ball. It occurs when the pitcher throws four balls outside of the strike zone, which is a violation of the rules. The two crossword solutions for this term are 'WALK' and 'PASS'. A 'WALK' is when the batter is allowed to advance to first base without hitting the ball, while a 'PASS' is when the batter is allowed to advance to first base without swinging at the ball.