What is the meaning of Tronc?

A monetary pool, in which tips are collected and later shared out between all staff, e.g. in a restaurant.

trunk, stem, branch

log

shaft

trunk, torso

frustrum

main branch

branch

team (pair of animals)

the central vertical part of a castell directly atop the baixos, as opposed to the various levels of the pinya

trunk

trunk

trunk, bole (of a tree)

poor box

trunk (of a tree)

thump

Source: wiktionary.org