Answer: pledging

AnswerCrossword Clue
PLEDGINGRush activity on campus
pledgingUndertake formally to give
pledgingPLEDGE, to bind by solemn promise
pledgingFormally declare or promise that something is or will be the case
pledgingCommit (a person or organization) by a solemn promise
pledgingSolemnly undertake to do something
pledgingDrink to the health of
pledgingPromise to join (a fraternity or sorority)
pledgingGive as security on a loan