箸渡し

1. 1passing a bone fragment from one pair of chopsticks to another while placing the remains of the deceased in a funerary urn ; two people picking up the same bone fragment with chopsticks at the same time Translated by Jiyomi
2. 2passing food from one pair of chopsticks to another (a breach of etiquette) ; two people picking up the same piece of food with chopsticks at the same time

JMdict entry 2829090. Source and licence.