1. plural of ollie; a skateboarding trick in which the rider pops the tail of the board against the ground to make the board jump into the air
Usage: informal; skateboarding
2. plural of ollie; a children's game in which players hide and one player calls out 'ollie ollie oxen free' to signal that it is safe to come out
Usage: informal; chiefly North American

Examples

• She practiced ollies on her skateboard every afternoon after school.
• The skater landed three consecutive ollies down the stairs.
• Kids were playing hide-and-seek in the park, and someone shouted 'ollies!'
• Learning to do ollies is the first step to mastering skateboarding tricks.
• He called out 'ollies' to let the other children know the game was over.