yardarm noun 1verb 1forms 3phrases 3 noun1 •The outer end of a yard, often equipped with blocks for reeving signal halyards.Sun's under the yardarm, sis! — 2006 verb1 •(old-fashioned) To be close or nearby each other. formsyardarmed · yardarming · yardarms Phrases with yardarm yardarm itTo begin to drink alcohol once it is late enough in the day. yardarm toVery close to, very nearby. yardarm to yardarmVery close to each other.