"Lisa is gabbai today, so she'll be giving out the aliyahs."

"We have a gabbai rishon [the one who calls people to say the blessings and follows along], but we still need a gabbai sheni [the one who only follows along to correct mistakes]."

"I'm gabbai-ing at shul this weekend."

"Since its founding the hegdesh had functioned normally. The city council had designated a monthly budget and the gabaim [trustees] did their work with devotion and loyalty." (source)